Two Suicide bombers have died in an attempt to attack a checkpoint in the early hours of Friday, according to an Associated Press report.
Two other explosions occurred hours later.
It was the fifth attack in three weeks on the city that is the birthplace of Nigeria’s homegrown Islamic extremist group, Boko Haram.
Before 4 a.m. Friday, police challenged two women and a man running toward the checkpoint opposite the Federal High Court, deputy police superintendent Victor Isuku said. One woman detonated, killing herself and the male accomplice. The other woman has been arrested and is being interrogated, he said.
No details were immediately available about two blasts that rang out around 8 a.m. (0700 GMT).
Boko Haram has recently stepped up attacks after a months-long lull in their Islamic uprising that has killed more than 20,000 people over seven years.
Security forces have managed to foil most of the attacks.