At least 27 worshippers were killed during dawn prayers when armed assailants stormed a mosque in Katsina state, Nigeria, early Tuesday morning. Local residents reported that gunmen opened fire inside the mosque in the remote community of Unguwan Matau around 4 a.m. Worshippers scattered in panic, but the attackers also targeted those fleeing. Several others were injured. No group has yet claimed responsibility. Authorities have deployed military and police forces to the area. Deadly armed raids are increasingly common in Nigeria’s northwest and central regions, often fueled by land and water disputes between herders and farmers. In June, more than 100 people were killed in a similar attack in north-central Nigeria.