Close to 50 people were killed in a suspected Boko Haram bombing in Nigeria's Borno state Tuesday.

“This is no doubt the handiwork of Boko Haram,” pro-government militia fighter Yuram Bura stated, according to Al Jazeera.

The blast hit near a crowded market in the town of Sabon Gari during the early afternoon. Medical sources say at least 47 have been confirmed dead, with another 50 suffering severe injuries.

Local media reported the explosion was caused by a female suicide bomber, though details of the attack remain scant. Despite authorities pointing the finger at Boko Haram, no group has claimed responsibility for the attack.

Over 600 people have been killed by Boko Haram since Nigerian President Muhammadu Buhari took office in May. Buhari won the presidential race with promises to roll back Boko Haram, which controls a chunk of Nigeria roughly the size of Belgium.

Boko Haram has been fighting to overthrow the Nigerian government since 2009 when it announced ambitions to forcibly establish an Islamic state. More than 13,000 people have been killed and over a million made homeless by Boko Haram violence since 2009, and the extremist group now controls the border crossings of Nigeria, Cameroon, Chad, and Niger.