Myanmar’s military junta bombed a Buddhist festival this week, killing at least two dozen people and injuring dozens more, according to a witness and the country’s civilian government in exile.

They said that a manned paraglider with a motor dropped a bomb on Monday evening on the festival, which doubled as a protest against the junta. A second witness also reported that a paraglider had carried out the strike.

The attack targeted Chaung U township in the Sagaing region, where about 100 people had gathered in a field after sunset to observe a Buddhist festival of lights with a candlelit event, said the witnesses, who spoke on the condition of anonymity for fear of reprisal.

Myanmar is in the middle of a brutal civil war that has killed tens of thousands of people and displaced millions of others. Military forces and rebel groups were not actively fighting in the area that was bombed on Monday.

At least 24 people were killed and at least 40 others were wounded in the attack on Monday, said the first witness and Nay Phone Latt, a spokesman for the National Unity Government, Myanmar’s civilian government in exile. Amnesty International, a human rights advocacy group, said that 18 people had been killed and 45 injured, many critically.

A member of the Sagaing Region Strike Forces, a resistance group fighting the military government, was among those killed on Monday evening, the group said in a statement.