Thirty-seven people have died in an air strike in southern Niger during military operations targeting Boko Haram, local officials say.

They were attending a funeral ceremony in Abadam village on the border with Nigeria when an unidentified plane began dropping bombs.

A military official told AFP news agency that an air strike had hit a mosque in the village of Abadam.

The deputy mayor of Abadam, Ibrahim Ari, told the BBC that a plane had dropped three bombs. One struck a group of mourners sitting in front of the residence of a local chief, adding that more than 20 people had been injured during the incident.

It is not yet clear who was responsible for the bombardment, but Nigeria has denied responsibility.

“It’s not to my knowledge and there has not been any report from our people of such an incident,” said Dele Alonge, a spokesman for Nigeria’s air force.

Niger has been the target of bombings in the past, blamed on Boko Haram since it widened its brutal insurgency.

Thousands of civilians and soldiers have been killed during the group’s campaign for a breakaway Islamic state.

Niger, Chad and Cameroon have recently formed a military coalition with Nigeria to help combat the threat.

•Adapted from a BBC report.