The first attack occurred at 0600 GMT in front of a camp for displaced persons in the Bakasi area and minutes later a second bomb went off at a bus stop, eyewitness said, Reuters reported.
Residents saw bodies being carried into an ambulance by government emergence services.
No group has claimed responsibility for the attacks but they bear the hallmark of Boko Haram Takfiri militants.
Boko Haram, whose name means “Western education is forbidden,” has claimed responsibility for a number of deadly shooting attacks and bombings in Nigeria since the beginning of their militancy in 2009, which has so far claimed the lives of at least 15,000 people and made more than 1.5 million displaced.
Back in February, four nations of the Lake Chad Basin -- Chad, Cameroon, Niger and Nigeria -- launched a campaign, together with a contingent from Benin, to confront the threat from Boko Haram militants in the region.