MAIDUGURI, Nigeria — Gunmen suspected of belonging to a radical Islamist sect ­attacked a village in northeast ­Nigeria, tying up men, women, and children before killing at least 15 in the troubled region’s latest attack, witnesses said Saturday.

The assault happened early Friday morning in the village of Musari on the outskirts of ­Maiduguri, the city where the sect known as Boko Haram first launched its guerrilla campaign of shootings and car bombings against Nigeria’s weak central government.