MAIDUGURI, Nigeria - Suspected Islamist militants dressed as soldiers rounded up and killed at least 42 villagers in Nigeria's northeast, the center of a mounting insurgency increasingly targeting civilians, a police source said.

The assault in Bardari late on Wednesday came a day after officials and witnesses said raiders killed dozens in three other villages in Borno region, where militant group Boko Haram first launched its campaign to carve out an Islamist state.

The gunmen in military uniform called the Bardari villagers together, then opened fire, the police source told Reuters. "The people couldn't identify them in time as terrorists," the source said.

Please LIKE our Facebook page - it makes us stronger