MAIDUGURI, Nigeria (AP) — Four women suicide bombers blew themselves up in northeastern Nigeria Saturday, killing one other person and wounding 10, when civilian guards prevented them from entering the city of Maiduguri, said an official.

The women blew themselves up when they were stopped for a body search by self-defense fighters on the outskirts of the city, said Sani Datti, spokesman of the National Emergency Management Agency.

Saturday's morning's attack was the latest in a wave of suicide bombings blamed on the Boko Haram Islamic extremist group that have killed hundreds in recent months.

Suicide bombers killed 42 people Friday in mosques in Maiduguri, the biggest city in the northeast and birthplace of Boko Haram, and Yola, 400 kilometers to the south. Nigeria's 6-year-old uprising has killed about 20,000 people and driven 2.3 million from their homes.