At least 40 have been killed in an explosion at a football field in Mubi, a town in Adamawa North Senatorial District in Adamawa State, North-East Nigeria.

An AFP report quotes a officer in the town as saying: “There has been a bomb explosion at a football field this evening and so far more than 40 people have been killed.”

A military source told Reuters that the number of those dead and injured is not clear at this time. He added that several bodies were recovered and the wounded are still being evacuated.

A witness told the news agency that the blast happened in the evening. The sources said the victims had been watching a televised match.

No group has claimed responsibility, though Boko Haram has staged attacks in the area in the past. The same group abducted over 200 schoolgirls in Nigeria on April 14 and is still holding them captive.

•Photo shows scene of a recent bomb blast in northern Nigeria.