At least 14 people were killed on Saturday when a volcano on the Indonesian island of Sumatra spewed lava and hot gas, an aid worker said.

“It is likely we’ll find more victims,” Benny Kaban, a local Protestant Minister and aid worker, said by telephone.

Mount Sinabung in North Sumatra’s Karo district has been erupting since September, displacing more than 30,000 people.

Saturday’s eruption came a day after the National Disaster Management Agency said residents living farther than 5 kilometres from the peak were being allowed to return to their homes after a lull in activity.

The 2,460—metre volcano had been dormant for 400 years before it erupted in August 2010.