At least eight people on board a rescue helicopter were killed after the chopper hit a cliff on Indonesia’s Butak Mountain near an active volcano. Ten others were injured after the Sileri Crater near popular tourist area Dieng Plateau erupted on Sunday at 12 pm, AP reported.

The aircraft had departed from Central Java at 4 pm on Sunday and was on its way to evacuate residents near the volcano when it crashed about three minutes before arriving at the plateau. Four Navy officers and four rescuers were on board the Dauphin AS365 helicopter.

At least 17 tourists were at the crater when it spouted cold lava and gases up to 50 m into the sky, injuring ten of them. They were treated at a community health center in the locality.

“Authorities asked visitors and residents to vacate the area because there was potential for the crater to erupt for a second time,” National Disaster Mitigation Agency’s spokesperson Sutopo Purwo Nugroho said, according to Jakarta Post.

Sileri is among the 10 craters at Dieng Plateau, a well-known tourist spot in Indonesia. In 2009, it unleashed volcanic materials up to 200 m into the sky, triggering the creation of three new craters. In 1979, the volcano spurted gases that ended up asphyxiating 140 people, AP reported.