Nigeria's military says separate operations to stop a radical Islamist sect saw four suspected members killed and 13 others arrested.
Lt. Col. Sagir Musa said Tuesday that the raids happened in Maiduguri, the city where the Boko Haram sect once had its main mosque.
Musa said the operations came after residents tipped off authorities about the sect's movements.
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. The sect is blamed for killing more than 430 people this year alone, according to an Associated Press count.