Police say a night-time explosion blamed on Boko Haram extremists has killed and wounded an unknown number of people at a bus station market in northeastern Nigeria.

Tuesday night's blast breaks a three-week hiatus in bombings after a string of suicide bombings culminated in twin attacks on mosques that killed 42 people and wounded more than 100 on Oct. 23.

One of the mosques attacked was in Yola, where the insurgents struck again on Tuesday.

Deputy Superintendent Othman Abubakar, the police spokesman for Adamawa state, did not have any casualty figures, but he said most of the victims were vendors and passers-by.

Nigeria's military has reported foiling several suicide bombers recently and killing and capturing insurgents as it destroys Boko Haram camps in air raids and ground attacks.

Some 20,000 people have been killed in the 6-year-old Islamic uprising that has spread to neighboring countries.