Authorities in New Zealand are telling airlines worldwide to avoid Tonga on their international routes following a volcanic eruption.

The Wellington Volcanic Ash Advisory Center says the Hunga Ha’apai volcano near Tonga’s capital city Nuku’alofa is sending a “dark volcanic cloud” 16,000 feet into the air and 10 nautical miles around the island.

Authorities say it’s impossible to know what is happening around the volcano because of the thickness of the volcanic ash cloud.

All flights into Tonga have been cancelled with no announcement as to when they might restart.

Hunga Ha’apai is the same volcano that first appeared roaring out of the Pacific Ocean in 2009 to create an island.

It is located on the Pacific Ring of Fire.