KANO, Nigeria — At least 30 people were killed in a triple suicide bombing in northeastern Nigeria, emergency services reported on Monday, in an attack bearing the hallmarks of the Boko Haram jihadist group.

Three bombers detonated their explosives late Sunday outside a hall in the town of Konduga, where soccer fans were watching a game on television. Konduga is about 22 miles southeast of Maiduguri, the capital of Borno State.

Usman Kachalla, the head of operations for the Nigerian emergency management agency, said on Monday: “The death toll from the attack has so far increased to 30. We have over 40 people injured.”

Ali Hassan, the leader of a self-defense group in Konduga, said that the attack happened at around 9 p.m. on Sunday and that the operator of the hall had prevented one of the bombers from entering the packed venue.