A female suicide bomber has blown herself up at a market in northeast Nigeria, killing at least 12 people.
There were no immediate claims of responsibility for Sunday's blast in Azare, a town in Nigeria's Bauchi State, but similar bombings have been carried out in the region by the Islamist militants of Boko Haram, who are waging an insurgency against the government.
Earlier Sunday, the Nigerian army said it had pushed Boko Haram militants out of the northeastern town of Chibok, the home of more than 200 schoolgirls the group kidnapped earlier this year.
Army officials say the military recaptured the town in an operation late Saturday, just two days after it was seized by Boko Haram.
Locals say the army was aided in the operation by a vigilante force.
There was no information about casualties from Saturday's battle.
Boko Haram has taken a number of towns in the northeastern states of Borno and Adamawa this year for a "caliphate" proclaimed by the group's leader, Abubakar Shekau.
Nigerian security forces and vigilante groups have succeeded in retaking some areas, including the Adamawa town of Mubi, freed during a battle on Thursday.
Fighting has continued despite a cease-fire announced by the Nigerian government on October 17. Shekau said in a subsequent video that no cease-fire existed and that the kidnapped schoolgirls had been converted to Islam and married off.
The kidnapping from a Chibok secondary school April 14 made headlines and drew outrage from around the world. The Nigerian government has been unable to rescue the schoolgirls, despite surveillance and intelligence help provided by the United States, Britain and other allies.