A female suicide bomber killed herself and seven others in northeastern Nigeria on Sunday morning as officials screened people fleeing attacks by Boko Haram.

Eight others were injured in the explosion at 10:40 a.m. on the outskirts of Maiduguri, the capital of Borno State, the state’s police commissioner, Aderemi Opadokun, said in a text message.

“Since the internally displaced persons were coming voluntarily into the town, it was decided that they had to be screened to avoid the insurgents mingling with them,” the chairman of Borno’s emergency agency, Ahmed Satomi, said separately by phone. “Just when the screening was on, one woman with explosive devices strapped on her rammed into others.”

Boko Haram, seeking to impose its version of Islamic law on Africa’s most populous country of about 180 million, has stepped up suicide attacks since President Muhammadu Buhari ordered the military to defeat the insurgents by the end of the year. The group has killed tens of thousands of people since its campaign began in 2009.

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