Story highlights Police official: At least 54 are killed and 139 wounded

3 of the 4 suicide bombers were females, witnesses say

The attack happened in a region terrorized by Boko Haram

Kano, Nigeria (CNN) More than 50 people were killed and scores wounded in a series of suicide bombings in northern Nigeria on Saturday, witnesses and authorities told CNN.

The blasts occurred in Maiduguri, the capital of the tumultuous Borno state, at the city's main market, a fish market and a bus station.

Four suicide bombers -- three women and a man -- carried out the attacks, according to witnesses.

No group immediately claimed responsibility for the bloodshed. But the Islamist extremist group Boko Haram has been behind many similar attacks in northern Nigeria and beyond, killing hundreds in recent months as part of its terrorist campaign to bring its twisted version of Sharia law to the region.

Clement Adoda, a Borno state police spokesman, said at least 54 people were killed and another 139 wounded in the suicide attacks.