Three blasts struck a mosque and the area near the building in Maiduguri, the Nigeria military spokesman said on Sunday.
A hospital source, speaking on condition of anonymity, said at least eight dead bodies had been recovered from the area, with many more feared dead, and around 50 injured people had been taken to hospital for treatment.
There was no immediate claim of responsibility for the explosions on the edge of the city centre but they bore the hallmarks of Islamist militant group Boko Haram.
“There were three improvised explosive devices explosions at Gomari and Ajilari general area in Maiduguri at about 7:21 p.m. [1821 GMT],” said military spokesman Colonel Sani Usman.
“Although details are not clear, it is important to note the attacks signify high level of desperation on the part of the Boko Haram terrorists,” he added.
A new audio message purportedly from Boko Haram leader Abubakar Shekau, which was released on social media on Saturday, calls the Nigerian army liars for saying troops have regained territory from the militant Islamist group