Unidentified gunmen shot down at least 16 people in a brutal assault on a Nigerian church Sunday after setting off explosives to draw worshipers outside. The attack came on a section of a university campus, a police spokesman said, and left an unknown number wounded. Gunfire continued to be heard in surrounding streets as security forces rushed to secure the campus, but the attackers reportedly escaped on motorcycles before police could arrive. No group claimed responsibility immediately after the attack, but the tactics were similar to those used by Boko Haram, a radical Islamist group that has mounted numerous attacks on the Nigerian government. A second attack was reported in the Northeast region of Nigeria, five people dying in a church shooting.