Suicide bombers killed at least 18 people Wednesday in three dawn attacks including in a mosque in the northeastern Nigerian town of Damaturu, officials and witnesses said. Separately, Boko Haram Islamic extremists attacked a rural military camp in northeastern Yobe state overnight but were repulsed by troops who killed at least 100 of the insurgents, the military said. Seven troops died in the fighting and nine were injured in the village of Goniri, said an Army spokesman.