Nigeria's military says soldiers killed four suspected members of a radical Islamist sect during a raid.

The raid happened Sunday in Kano, Nigeria's largest city in its predominantly Muslim north.

Military spokesman Lt. Iweah Ikedichi said Monday the raid came after soldiers received reports that an area had become a safe haven for the radical Islamist sect Boko Haram.

The lieutenant said four suspected Boko Haram members were killed, while others were arrested.

Boko Haram is waging an increasingly bloody fight against Nigeria's weak central government in its effort to enact strict Shariah law across the multiethnic nation of more than 160 million people and free its imprisoned members.