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 . Suleiman Bulunkutu said he and others involved in the rescue operation had taken about 50 bodies to the Maiduguri General Hospital morgue . `` This toll does n't include those taken to three other hospitals , '' Bulunkutu said . `` Therefore , the‎ final ( death ) toll may be higher . '' In the first blast , a woman dressed in a hijab got off a motorized rickshaw and blew herself up outside the Baga Road fish market around 11:20 a.m. ( 5:20 a.m . ET ) , fish trader Mohammed Boni said . The next attack took place about an hour later outside Monday Market , the main one in the city , where people were lined up to go through security . Those measures -- in which people are checked for explosives and guns -- were set up because of the spate of Boko Haram attacks in the city and region . Two women joined the female security line , one of whom `` blew herself up , causing minimal casualty , '' said witness Abdulkarim Musa . Then , as people gathered to help , the second woman detonated her explosives , said Musa , who was waiting outside the market in the male security line . The third attack occurred at a bus station . `` He came in our midst near the bus station and pressed a remote device he was holding in his hand , '' a wounded survivor who requested anonymity for his personal safety said from Maiduguri General Hospital . Such attacks , sadly , are nothing new for Borno State , one of those hit hardest by Boko Haram and the Nigerian military 's campaign to stop them . The terrorist group has not only bombed crowded markets but attacked churches and mosques , raided villages , and kidnapped people young and old -- most famously the more than 200 girls taken last April from a school in Chibok .
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 .