A lone suicide bomber has killed at least 13 people in a blast that rippled through the northern city of Maiduguri, authorities in the West African nation said.
A woman, suspected of being a Boko Haram fighter, strapped with explosives detonated his vest in a crowded part of a city car park. Boko Haram has not laid claims on the attack.
But the group has mounted an insurgency in Northern Nigeria since 2007 killing more than 25,000 people and displacing more than two million others.
A second suicide attack by two female bombers was less successful but left scores wounded. Two attackers died and more than a dozen people were rushed to a nearby medical center.
Maiduguri is the state capital of Borno State, the birthplace of the Boko Haram group, which started as a campaign against Western education.
Nigeria’s army said it has destroyed several Boko Haram camps in an airstrike in Borno following the attacks. The latest attacks have raised security fears among citizens, who are relying on vigilante groups to keep them safe.