A volcano in Eastern Indonesia erupted Friday, sending hot ash into the air and surprising hikers all over the mountain.

Officials say that nine people were injured and at least one person is missing as the hot ash continues to fall on the mountain.

A spokesman for Indonesia’s Disaster Mitigation Agency said that Mount Gamalama sent a plume of smoke over 6,500 feet into the sky.  Slow moving lava has been moving down the peak but no evacuation orders have been issued to surrounding villages.

The airport in Ternate, about 20 miles from the volcano, has been forced to close.  Schools and offices were also closed and evacuated because of the ash.

Mount Gamalama, located on the Pacific Ring of Fire, had its last major eruption in 2012.