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Boko Haram suicide bomber explodes himself, kills 4 hawkers at northeast Nigerian bus station

FILE- In this Tuesday, Feb. 24, 2015 photo, Men inspect a bus  following an explosion in one of the recent suicide bomb explosion in a bus station in Potiskum, Nigeria. A teenage suicide bomber blew herself up and killed seven other people Saturday, May 16, 2015, outside a bustling bus station in the northeast Nigerian town of Damaturu, the state medical director said of the latest in a string of attacks this week by Nigeria's home-grown Boko Haram extremists. Thirty-three people were seriously injured and are being treated at the hospital, said Yobe state's medical director Garba Musa Fika. (AP Photo/Adamu Adamu file )

FILE- In this Tuesday, Feb. 24, 2015 photo, Men inspect a bus following an explosion in one of the recent suicide bomb explosion in a bus station in Potiskum, Nigeria. A teenage suicide bomber blew herself up and killed seven other people Saturday, May 16, 2015, outside a bustling bus station in the northeast Nigerian town of Damaturu, the state medical director said of the latest in a string of attacks this week by Nigeria's home-grown Boko Haram extremists. Thirty-three people were seriously injured and are being treated at the hospital, said Yobe state's medical director Garba Musa Fika. (AP Photo/Adamu Adamu file )  (The Associated Press)

Witnesses say a suicide bomber exploded himself and killed four hawkers at a bustling bus station in the northeastern Nigerian town of Damaturu.

A nurse said the five bodies and 15 injured women and children are at the hospital. The wounded are mostly hawkers who sell smoked fish and water packets at the exit to the Damaturu Central Motor Park. He insisted on anonymity because he is not allowed to speak to reporters.

Saturday's attack is the latest in a series this week blamed on Boko Haram, Nigeria's home-grown Islamic extremists and come weeks after the military said they had the insurgents trapped in a forest stronghold.

But the militants seized back the border town of Marte on Friday and attacked Maiduguri, the biggest city in northeastern Nigeria, on Thursday.