Tag Archives: Toxic Gas

Authorities say air still breathable in La Palma as lava pours into sea

LA PALMA, Spain (Reuters) -A river of lava cascaded into the Atlantic Ocean from Spain’s La Palma island in the early hours on Wednesday, releasing plumes of steam which could unleash toxic gas, although so far authorities said the air inland had not been contaminated.

Thousands of people have been evacuated since an eruption in the Canary Islands archipelago began 10 days ago. Three coastal villages had been locked down since Monday in anticipation of the lava reaching the sea and potentially liberating harmful gases.

Residents on the western coast had been told to seal doors and windows with tape and wet towels. That recommendation was not yet lifted, but authorities said measurements showed the air was so far still safe to breathe.

“The eruption has not affected air quality, which is perfectly breathable. Teams measuring the presence of gases make periodic checks and have not registered values that could be considered dangerous,” the La Palma Council said on Twitter.

Incandescent lava gushing from the volcano poured down a cliff into the sea early on Wednesday in the Playa Nueva area near the town of Tazacorte and could be seen protruding above the Atlantic Ocean waterline, sending clouds of steam into the sky.

Smoke clouds billowed from the volcano and the molten rock as it flowed down Cumbre Vieja’s western flank.

“All the people in a 2-km radius have been evacuated” and a wider area is in lockdown, Tazacorte Mayor Juan Miguel Rodriguez Acosta told TV3 channel, adding that no further evacuations had been needed so far as the cloud was moving east.

He said all roads to the southern part of the island on the western side had been cut off by the lava.

Since the eruption began on Sept. 19, lava has engulfed nearly 530 houses, as well as 1,200 land plots, mostly banana plantations. Spain classified La Palma as a disaster zone on Tuesday, a move that will trigger financial support for the island.

($1 = 1.1714 euros)

(Reporting by Miguel Pereira, Marco Trujillo, Jon Nazca, Nacho Doce and Borja Suarez in La Palma; Writing by Inti Landauro and Andrei Khalip; editing by Mark Heinrich, Giles Elgood, Peter Graff)

Ocean, jungle explosions new risks from Hawaii eruption

A lava fountain is observed from a helicopter flight over the Fissure 22 in Kilauea Volcano's Lower East Rift Zone during ongoing eruptions of the Kilauea Volcano in Hawaii, U.S. May 21, 2018. Picture taken on May 21, 2018. USGS/Handout via REUTERS

By Jolyn Rosa

HONOLULU (Reuters) – Lava from Hawaii’s erupting Kilauea volcano is exploding as it pours into the ocean, shooting rock fragments that are a danger to boaters. Inland, where molten rock is burning through jungle, methane explosions are hurling boulders while toxic gas is reaching some of the highest levels seen in recent times.

These were new risks geologists warned of on Tuesday as Kilauea’s 19-day eruption showed no sign of easing, with repeated explosions at its summit and fountains of lava up to 160 feet (50 m) from giant cracks or fissures on its flank.

A Hawaii Air National Guard Airman observes three lava fissures at Leilani Estates and Lanipuna Gardens subdivisions in Pahoa, Hawaii, U.S., May 15, 2018. Courtesy John Linzmeier/U.S. Air National Guard/Handout via REUTERS

A Hawaii Air National Guard Airman observes three lava fissures at Leilani Estates and Lanipuna Gardens subdivisions in Pahoa, Hawaii, U.S., May 15, 2018. Courtesy John Linzmeier/U.S. Air National Guard/Handout via REUTERS

Lava edged towards a geothermal power plant on Tuesday after destroying an old warehouse near the facility, County of Hawaii Civil Defense said.

Workers at the closed Puna Geothermal Venture, which provided around 25 percent of electricity on Hawaii’s Big Island, worked to cap the last of three pressurized wells to reduce the risk of an uncontrolled release of toxic gases should they be inundated by lava.

The race at the site marked the latest challenge facing authorities during what geologists call an unprecedented, simultaneous eruption at Kilauea’s summit and from giant fissures 25 miles (40 km) down its eastern side.

“Fissures near Puna Geothermal Venture are active and producing lava slowly flowing onto the property,” Civil Defense said in a statement. “This activity has destroyed the former Hawaii Geothermal Project site,” it said referring to the warehouse.

An explosive eruption at the Kilauea summit at 3:45 a.m. (9:45 a.m. EST) sent ash to a height of 8,000 feet (2,438 meters) over Hawaii’s Big Island, civil defense said. Communities southwest of the summit were dusted with ash, said National Weather Service meteorologist John Bravender.

On the volcano’s east flank, nearly two-dozen fissures are producing 15,000 tons a day of toxic sulfur dioxide, a level “much higher than seen in recent times,” Bravender said.

Lava is seen spewing from fissures in Pahoa, Hawaii, U.S., May 22, 2018 in this picture obtained from social media. Kris Burmeister/via REUTERS

Lava is seen spewing from fissures in Pahoa, Hawaii, U.S., May 22, 2018 in this picture obtained from social media. Kris Burmeister/via REUTERS

MORE VIOLENT PHASE

The Puna district’s geothermal plant has been closed since shortly after lava began erupting on May 3 through newly opened fissures in the ground running through neighborhoods and roads in an area near the community of Pahoa.

About 3 miles (4.8 km) to the east of the plant on the coast, noxious clouds of acid fumes, steam and fine glass-like particles billowed into the sky as lava poured into the ocean from two lava flows.

At least 47 homes and other structures have been destroyed by nearly two dozen fissures in the Leilani Estates and Lanipuna Gardens, and a man was seriously injured on Saturday by flying lava. Around two thousand people have been forced to evacuate, and many others have voluntarily left their homes.

(Reporting by Jolyn Rosa; Writing by Andrew Hay; Editing by Bill Tarrant and Sandra Maler)

Lava creeps onto geothermal plant site on Hawaii’s Big Island

Lava flows downhill in this helicopter overflight image of Kilauea Volcano's lower East Rift zone during ongoing eruptions in Hawaii, U.S. May 19, 2018. USGS/Handout via REUTERS

By Terray Sylvester

PAHOA, Hawaii (Reuters) – Molten lava from the erupting Kilauea Volcano on Hawaii’s Big Island crept onto a geothermal power plant site on Monday, as workers rushed to shut down the facility to prevent the uncontrollable release of toxic gases.

Crews worked into the night to cap the 11th and final well at the Puna Geothermal Venture (PGV) plant, which provides about 25 percent of the Big Island’s power, as lava from an active fissure flowed 200 to 300 yards from the nearest well pad, county and federal officials said.

“County, state, and federal partners have been collaborating closely to monitor the situation and work with PGV to ensure the safety of the surrounding communities,” the county said.

The race at the site marked the latest challenge facing authorities as they cope with what geologists rank as one of the biggest upheavals in a century from one of the world’s most active volcanoes.

The latest explosive eruption at the Kilauea summit occurred shortly before 6 p.m. local time, the Hawaiian Volcano Observatory reported.

“The resulting ash plume may affect surrounding areas,” it said.

The plant has been closed since shortly after lava began erupting on May 3 through newly opened fissures in the ground running through neighborhoods and roads on the far eastern flank of Kilauea.

Within a week, some 60,000 gallons (227,124 liters) of the highly flammable chemical pentane, which was stored at the plant, were moved from harm’s way. The state said last week it was pumping cold water into the wells and would cap them with iron plugs.

The plant’s wells run 6,000 to 8,000 feet (1,829-2,438 meters) underground to tap into extremely hot water and steam used to run turbines and produce electricity.

LAZE ALERT

About 3 miles (4.8 km) to the east of the plant on the coast, noxious clouds of acid fumes, steam and fine glass-like particles billowed into the sky as lava poured into the ocean from two flows cutting across Highway 137, one of the main exit routes from the eruption zone.

Laze — a term combining the words “lava” and “haze” — is formed when erupting lava, which can reach 2,000 degrees Fahrenheit (1,093 degrees Celsius), reacts with sea water. It is potentially deadly if inhaled.

“If one were to be near the laze, because of the various acids, it would be corrosive to the eyes, the nose and respiratory tract, and the skin,” Dr. Alvin Bronstein from the Hawaii State Department of Health told journalists on a conference call.

Laze killed two people when a lava flow reached the coast in 2000, and authorities warned residents to stay clear of it.

Another hazard was the potential for methane gas explosions as searing lava neared pockets of rotting vegetation, igniting traces of the flammable gas given off by the decay.

“These are quite a big hazard in vegetative areas and the explosions can occur well away from the lava flow itself,” USGS geologist Janet Babb said on the call.

Geologists say Kilauea’s eruption, which has already produced around two dozen lava-spewing fissures, has now entered a more violent phase, in which larger volumes of molten rock are oozing from the ground and traveling farther than before.

At least 44 homes and other structures have been destroyed in the Leilani Estates and Lanipuna Gardens area of the Puna district, and a man was seriously injured on Saturday when a plate-sized chunk of molten shot out of a fissure and struck him on the leg.

Two thousand people have been ordered from their homes due to lava flows and toxic sulfur dioxide gas, levels of which have tripled in the last two days, according to civil defense officials. The Hawaii National Guard has warned of more mandatory evacuations if further highways are blocked.

(Reporting by Terray Sylvester, additional reporting by Jolyn Rosa in Honolulu; Writing by Andrew Hay; Editing by Sandra Maler, Joseph Radford and Raissa Kasolowsky)

Hawaii volcano spews 6 mile-high plume of ash, could blow again

Lava spattering area from an area between fissures 16 and 20 is seen in Hawaii, U.S. May 16, 2018. Picture taken on May 16, 2018. USGS/Handout via REUTERS

By Terray Sylvester

PAHOA, Hawaii (Reuters) – Hawaii’s Kilauea volcano spewed ash nearly six miles (9 km) into the sky on Thursday and scientists warned this could be the first in a string of more violent explosive eruptions with the next possibly occurring within hours.

“This has relieved pressure temporarily,” U.S. Geological Survey geologist Michelle Coombs told a news conference in Hilo. “We may have additional larger, powerful events.”

Residents of the Big Island were warned to take shelter from the ash as toxic gas levels spiked in a small southeast area where lava has burst from the ground during the two-week eruption.

The wind could carry Kilauea’s ash plume as far as Hilo, the Big Island’s largest city and a major tourism center, the County of Hawaii Civil Defense warned in an alert.

A person is silhouetted against the light from lava in Pahoa, Hawaii, U.S., May 17, 2018 in this picture obtained from social media on May 18, 2018. KRIS BURMEISTER/via REUTERS

A person is silhouetted against the light from lava in Pahoa, Hawaii, U.S., May 17, 2018 in this picture obtained from social media on May 18, 2018. KRIS BURMEISTER/via REUTERS

“Protect yourself from ash fallout,” it said.

Some Big Island residents had feared “the big one” after Kilauea shot anvil-sized “ballistic blocks” into the visitors’ car park on Wednesday and was rocked by earthquakes that damaged buildings and cracked roads in the park that was closed last week.

But geologists said the 4:15 a.m. (10:15 a.m. EDT) explosion was not particularly large and on a par with the last series of steam-driven blasts, which took place in 1924.

“The activity is such that they can occur at any time, separated by a number of hours,” Hawaiian National Volcano Observatory Deputy Scientist-In-Charge Steve Brantley told reporters on a conference call.

Geologists said it was extremely unlikely Kilauea would have a massive eruption like that of 1790 which killed dozens of people in the deadliest eruption to occur in what is now the United States.

Kilauea’s falling lava lake has likely descended to a level at or below the water table, allowing water to run on to the top of its lava column and create steam-driven blasts, they said.

“I don’t think there is a big one that’s coming,” said University of Hawaii vulcanologist Scott Rowland.

“I think it’s going to be a series of explosions similar to the one that happened this morning, and that’s based on what happened in 1924, which is really our only analog,” he said of the nearly century old event, which lasted 2-1/2 weeks and killed one person who was hit by a “ballistic block.”

On Thursday, a 21st fissure also opened in Leilani Estates while other fissures reactivated with lava, the Hawaii Civil Defense said in an alert.

People wait in line for free dust masks in Keaau to protect themselves from volcanic ash during ongoing eruptions of the Kilauea Volcano in Hawaii, U.S., May 17, 2018. REUTERS/Terray Sylvester

People wait in line for free dust masks in Keaau to protect themselves from volcanic ash during ongoing eruptions of the Kilauea Volcano in Hawaii, U.S., May 17, 2018. REUTERS/Terray Sylvester

ASH MASKS

A spike in toxic sulfur dioxide gas levels closed schools around the town of Pahoa, 25 miles (40 km) east of the volcano, where lava from giant cracks has destroyed 37 homes and other structures and forced about 2,000 residents to evacuate.

A change in wind direction caused gas spewing from fissures to drift northwest towards Pahoa, prompting National guard troops to don gas masks at a nearby road intersection, according to a Reuters reporter.

Pahoa fire station recorded a “red level” of sulfur dioxide, meaning the gas would cause choking and an inability to breathe, Fenix Grange of the Hawaii Department of Health told a news conference in Hilo.

“If it’s red, it’s get out of Dodge,” she said.

There have been no deaths or serious injuries reported during the current eruption.

Civil defense workers handed out one ash mask per family member in communities close to Kilauea to protect residents from the powdered rock, which is not poisonous but causes irritation to eyes and airways.

Volunteers handed out some 5,000 dust masks in less than three hours in the community of Kea’au, north of Pahoa at one of the four distribution points that were opened on Thursday.

“It was just thick, eyes watering kinda stuff,” said Glenn Severance, 65, a resident of Hawaii Paradise Park.

“I just wanted to have something,” said Severance, adding he knew the mask would not protect against toxic volcanic gases.

An aviation red alert was in effect due to risks ash could be carried into aircraft routes and damage jet engines, USGS said. Passenger jets generally cruise at around 30,000 feet, the height of Thursday’s plume.

A geologist inspects cracks on a road in Leilani Estates, following eruption of Kilauea volcano, Hawaii May 17, 2018. United States Geological Survey (USGS)/Handout via REUTERS

A geologist inspects cracks on a road in Leilani Estates, following eruption of Kilauea volcano, Hawaii May 17, 2018. United States Geological Survey (USGS)/Handout via REUTERS

Across the Big Island, home to 200,000 residents, people were encouraged to take caution driving, as ashfall can make roads slippery, and not go outdoors unless necessary.

But by 1:30 p.m. (7:30 p.m. EDT) reported ashfall was limited to only light, wet deposits about 3-4 miles (5-6 km) northwest of the summit, as rain over the volcano curbed the spread of ash.

Thursday’s eruption lasted only a few minutes, said Coombs who called it “a big event that got people’s attention, but did not have widespread impact”.

“Tall but small,” she said of Thursday’s plume.

(Additional reporting by Jolyn Rosa in Honolulu; Writing by Andrew Hay; Editing by Bill Tarrant, Sandra Maler and Himani Sarkar)

Toxic gas alert for Hawaii volcano eruption; new areas at risk

Deposits are seen on a road in Puna, Hawaii. Apau Hawaii Tours/via REUTERS

By Terray Sylvester

PAHOA, Hawaii (Reuters) – Residents on the Big Island of Hawaii were alerted on Thursday to rising levels of toxic gas from lava-oozing fissures, and geologists warned that new areas east of the erupting Kilauea volcano may be at risk of molten rock bursting from the ground.

Hawaii County authorities sent a text message to residents of the southeast corner of the island warning them of a wind change that would bring rising levels of sulfur dioxide gas, which can be fatal if inhaled in large quantities.

“It’s just horrible. You can’t breathe in there,” said evacuated resident Robynn Stagg, 58, who drove through the thick, orange sulfur dioxide haze earlier this week in a failed attempt to check on her home.

Hawaii’s governor has warned that mass evacuations may be required as more fissures open in the ground and spew lava and gas into semi-rural residential areas on the east flank of Kilauea, one of the world’s most active volcanoes.

During an evening meeting with community members, an official with the United States Geological Survey’s Hawaii Volcano Observatory said that while no new fissures have opened during the last 24 hours, there has been “quite a bit” of ground cracking over the last day and that they were releasing steam.

“Because the lava intrusion is still active and earthquakes are still occurring, we still think there’s a decent chance of new eruptive activity at the surface,” Steven Brantley said.

Authorities on Thursday completed the removal of highly flammable chemicals from a nearby geothermal power plant that was in the path of creeping lava.

The latest upheaval at Kilauea began last week after the crater floor of a long-active side vent collapsed suddenly in a cloud of ash, triggering a similar plunge in the molten lake inside the larger crater at the volcano’s summit.

What followed was a flurry of earthquakes as huge volumes of magma — the term for lava beneath the surface — drained back through deep-underground passages that carried the molten rock far downslope. The lava then forced its way back to the surface through large cracks, or fissures, that opened at ground level in a residential area miles (km) a

‘BALLISTIC BLOCKS’

Geologists said Kilauea may be entering a new phase of explosive eruptions not seen in nearly a century that could hurl “ballistic blocks” weighing up to 12 tons for half a mile (800 meters), and rain pebble-sized fragments for another mile or two (1.8 to 3.2 km).

However, the immediate vicinity around the summit, an area controlled by the National Park Service, was to be closed to visitors indefinitely, starting on Thursday night.

Such blasts would likely also eject plumes of volcanic ash that could be carried farther downwind into neighboring communities, creating a nuisance and potential respiratory irritant, but not a life-threatening hazard, officials said.

The Leilani Estates community remains in greatest danger, with 15 volcanic fissures so far having destroyed 36 structures, most of them homes, and forcing the evacuation of about 2,000 residents.

But as the eruption progresses, “other areas of the lower East Rift Zone may also be at risk,” the Hawaiian Volcano Observatory said in a bulletin.

“There is the potential for additional outbreaks,” Christina Neal, the chief scientist at the U.S. Geological Survey’s Hawaiian Volcano Observatory at Kilauea told a news briefing. “There are other communities, other residential neighborhoods that could, depending on the evolution of activity, be in harm’s way.”

Hawaii Governor David Ige has requested federal disaster assistance as he said a mass evacuation of the lower Puna District, where Leilani Estates is located, would be beyond current county and state capabilities.

Hawaii police said they arrested Alexandru Stingu-Dragomir, 29, on suspicion he burgled four houses in Leilani Estates after the mayor declared an emergency the area on last week.

SURFING IN THE VOG

Local meteorologists said the change in prevailing winds could send Kilauea’s volcanic smog, or vog, northwest to Maui and other islands in Hawaii.

Surfers bobbing in the ocean off Kona on the west side of the Big Island complained of the smog that could be seen in a haze over the coast.

“Does that hat protect against vog?” one surfer was heard quipping to another about the floppy sun hat he was wearing.

In Pahoa, the nearest village to Kilauea, some schools remained closed after the area was hit by a 6.9 magnitude earthquake on Friday, the biggest since 1975.

The closures have added to a sense of disarray and ramped up stress levels, said gallery owner Amedeo Markoff, 49.

“It’s like our version of a snow day — a lava day,” joked Markoff.

(Reporting by Terray Sylvester and Jolyn Rosa; Writing and additional reporting by Andrew Hay in New Mexico; Editing by Bill Tarrant and Sandra Maler)

Syria toxic gas inquiry to end after Russia again blocks U.N. renewal

Syria toxic gas inquiry to end after Russia again blocks U.N. renewal

By Michelle Nichols

UNITED NATIONS (Reuters) – An international investigation into who is to blame for chemical weapons attacks in Syria will end on Friday after Russia blocked for the third time in a month attempts at the United Nations to renew the inquiry, which Moscow has slammed as flawed.

In the past two years, the joint U.N. and the Organization for the Prohibition of Chemical Weapons (OPCW) inquiry has found the Syrian government used the nerve agent sarin in an April 4 attack and has also several times used chlorine as a weapon. It blamed Islamic State militants for using mustard gas.

Russia vetoed on Friday a Japanese-drafted U.N. Security Council resolution to extend the inquiry for one month. It was an eleventh-hour bid to buy more time for negotiations after Russia blocked U.S.-drafted resolutions on Thursday and Oct. 24 to renew the investigation, which the council created in 2015.

Syrian ally Russia has cast 11 vetoes on possible Security Council action on Syria since the country’s civil war began in 2011. The Japanese draft received 12 votes in favor on Friday, while China abstained and Bolivia joined Russia to vote no.

After Friday’s vote, the council moved to closed-door discussions at the request of Sweden’s U.N. Ambassador Olof Skoog to “ensure we are absolutely convinced we have exhausted every avenue, every effort” to try and renew the investigation.

After a brief discussion, Italian U.N. Ambassador Sebastiano Cardi, council president for November, told reporters: “The council will continue to work in the coming hours and days, constructively, to find a common position.”

Russian U.N. Ambassador Vassily Nebenzia told the council earlier on Friday that the inquiry could only be extended if “fundamental flaws in its work” were fixed. He said that for the past two year the investigators had “rubber-stamped baseless accusations against Syria.”

The council voted on a rival Russian-drafted resolution on Thursday to renew the inquiry, but it failed after only garnering four votes in favor.

A resolution needs nine votes in favor and no vetoes by the United States, France, Russia, Britain or China to be adopted.

“Russia is wasting our time,” U.S. Ambassador to the United Nations Nikki Haley told the council on Friday.

“Russia’s actions today and in recent weeks have been designed to delay, to distract and ultimately to defeat the effort to secure accountability for chemical weapons attacks in Syria,” Haley said.

While Russia agreed to the creation of the inquiry two years ago, it has consistently questioned its work and conclusions.

The April 4 sarin attack on Khan Sheikhoun that killed dozens of people prompted the United States to launch missiles on a Syrian air base. Haley warned on Thursday: “We will do it again if we must.”

Despite the public deadlock and war of words between the United States and Russia at the United Nations, White House spokeswoman Sarah Sanders said on Thursday that President Donald Trump believed he could work with Russian President Vladimir Putin on issues like Syria.

Syria agreed to destroy its chemical weapons in 2013 under a deal brokered by Russia and the United States.

(Reporting by Michelle Nichols; Editing by James Dalgleish and Lisa Shumaker)

U.S., Russia set for likely U.N. row over Syria toxic gas inquiry

FILE PHOTO: A United Nations (U.N.) chemical weapons expert, wearing a gas mask, holds a plastic bag containing samples from one of the sites of an alleged chemical weapons attack in the Ain Tarma neighbourhood of Damascus, Syria August 29, 2013. REUTERS/Mohamed Abdullah/File Photo

By Michelle Nichols

UNITED NATIONS (Reuters) – The United States said on Wednesday it would push the United Nations Security Council to renew within days an international inquiry into who is to blame for chemical weapons attacks in Syria, setting the stage for a likely showdown with Russia.

Russia has questioned the work and future of the joint inquiry by the U.N. and the Organization for the Prohibition of Chemical Weapons (OPCW), and said it would decide whether to support extending the mandate after investigators submit their next report.

The inquiry, known as the Joint Investigative Mechanism (JIM), is due to report by Oct. 26 on who was responsible for an April 4 attack on the opposition-held town of Khan Sheikhoun that killed dozens of people.

“We would like to see it renewed prior to the report coming out,” U.S. Ambassador to the U.N. Nikki Haley told reporters.

“The Russians have made it very clear that should the report blame the Syrians suddenly they won’t have faith in the JIM. If the report doesn’t blame the Syrians then they say that they will. We can’t work like that,” Haley said.

A separate OPCW fact-finding mission determined in June that the banned nerve agent sarin had been used in the Khan Sheikhoun attack, which prompted the United States to launch missiles on a Syrian air base.

Haley said she would circulate a draft resolution to the 15-member Security Council later on Wednesday to renew the mandate for the JIM, which is due to expire in mid-November. It was unanimously created by the council in 2015 and renewed in 2016.

A resolution must get nine votes in favor and not be vetoed by any of the council’s five permanent members – Russia, China, the United States, Britain and France – in order to pass.

The JIM has found that Syrian government forces were responsible for three chlorine gas attacks in 2014 and 2015 and that Islamic State militants used mustard gas.

Syria agreed to destroy its chemical weapons in 2013 under a deal brokered by Russia and the United States. The Syrian government has repeatedly denied using chemical weapons during a civil war that has lasted more than six years.

Mikhail Ulyanov, director of the Russian Foreign Ministry’s non-proliferation and arms control department, said on Friday there were “serious problems” with the work of the inquiry.

“In order to judge if it deserves an extension of the mandate, we need to see the report … and assess it,” Ulyanov told a briefing at the United Nations to present Moscow’s view on the “Syrian chemical dossier.”

(Reporting by Michelle Nichols; Editing by Paul Simao)

Rescuers say toxic gas dropped on Syrian town where Russian helicopter shot down

Video of people affected by chemical attack

By Lisa Barrington

BEIRUT (Reuters) – A Syrian rescue service operating in rebel-held territory said on Tuesday a helicopter dropped containers of toxic gas overnight on a town close to where a Russian military helicopter had been shot down hours earlier.

The opposition Syrian National Coalition (SNC) accused President Bashar al-Assad of being behind the attack. Assad has denied previous accusations of using chemical weapons.

A spokesman for the Syria Civil Defence said 33 people, mostly women and children, were affected by the gas, which they suspect was chlorine, in Saraqeb, in rebel-held Idlib province.

The group, which describes itself as a neutral band of search and rescue volunteers, posted a video on YouTube apparently showing a number of men struggling to breathe and being given oxygen masks by people in civil defense uniforms.

“Medium-sized barrels fell containing toxic gases. The Syrian Civil Defence was not able to determine the type of the gas,” said the spokesman.

The Syrian government and its Russian allies were not immediately available for comment.

Later, state news agency SANA said rebels had fired rockets armed with toxic gas on the government-held old quarter of Aleppo city, killing five people and causing eight breathing difficulties. It gave no further details. Rebels have denied previous accusations of using chemical weapons.

The SNC said of the reported use of poison gas in Saraqeb: “After shelling, besieging and killing civilians and perpetrating war crimes on them, the Assad regime has resorted once again, and in breach of UN resolutions 2118 and 2235, to using chemical substances and toxic gases.

“The daily reality confirms that all the international agreements and previous security council decisions, be they about chemical weapons or otherwise, are meaningless for the Assad regime.”

The Civil Defence spokesman said it was the second time Saraqeb had been hit by toxic gas. The group was aware of around nine suspected chlorine gas incidents across Idlib province since the conflict began, he said.

The U.S. State Department said it was looking into the reported use of chemical weapons in Saraqeb.

“I’m not in a position to confirm the veracity of (the reports),” said spokesman John Kirby. “Certainly, if it’s true, it would be extremely serious.”

Monitors at the Britain-based Syrian Observatory for Human Rights, which tracks violence on all sides in the civil war, said barrel bombs fell on Saraqeb late on Monday, wounding a large number of citizens.

Russia’s defense ministry said a Russian helicopter was shot down near Saraqeb during the day on Monday, killing all five people on board, in the biggest officially acknowledged loss of life for Russian forces since they started operations in Syria.

DENIALS

The helicopter came down roughly mid-way between Aleppo and Russia’s main air base at Hmeimim in the western province of Latakia, near the Mediterranean coast.

Russian air power began supporting Syrian President Bashar al Assad late last year, an intervention which tipped the balance of the war in Assad’s favor, eroding gains the rebels had made that year.

No group has claimed responsibility for downing the Mi-8 military transport helicopter.

Government and opposition forces have both denied using chemical weapons during the five-year-old civil war. Western powers say the government has been responsible for chlorine and other chemical attacks. The government and Russia have accused rebels of using poison gas.

U.N. investigators established that sarin gas was used in Eastern Ghouta in 2013. The United States accused Damascus of that attack, which it estimates killed 1,429 people, including at least 426 children. Damascus denied responsibility, and blamed rebels.

Later that year the United Nations and the Syrian government agreed to destroy the state’s declared stockpile of chemical weapons, a process completed in January 2016.

The Organisation for the Prohibition of Chemical Weapons confirmed in late 2015 that sulfur mustard, commonly known as mustard gas, had been used for the first time in the conflict, without saying which party in the many sided conflict it thought had used it.

(Additional reporting by Lesley Wroughton in Washington; Editing by Samia Nakhoul and Robin Pomeroy)