KANO, Nigeria (AP) — Gunmen attacked church services on a university campus on Sunday in northern Nigeria, using small explosives to draw out panicked Christian worshipers, who were then shot in an assault that killed at least 16 people, officials said.

The gunmen attacked an old section of Bayero University’s campus where religious groups use a theater and other areas to hold worship services, said a spokesman for the Kano State police, Ibrahim Idris. Many others were wounded before the gunmen fled on motorcycles, Mr. Idris said.