Maiduguri, Nigeria - The targeted killing of three police officers in northern Nigeria has investigators worried a radical Muslim sect may be making a violent comeback.
Two state police commissioners told reporters late Thursday that they suspect members of the Boko Haram sect committed the shootings.
An inspector and corporal were killed in Maiduguri on Wednesday night, while another policeman was killed while guarding the personal residence of Yobe state's governor.
Police say they've arrested two suspected Boko Haram members downloading sermons from the cult's slain leader Mohammed Yusuf.
Boko Haram — which means "Western education is sacrilege" — attacked police stations in July 2009, sparking a violent military and police crackdown. More than 700 died.