ABUJA, Nigeria — The death toll from a shooting at a mosque in northwestern Nigeria has risen to 50, a local official said Wednesday. Gunmen stormed the mosque in the town of Unguwan Mantau, in Katsina state, during morning prayers on Tuesday, according to lawmaker Aminu Ibrahim.

Such attacks have become common in Nigeria’s northwestern, north-central regions, where local herders and farmers clash.

Gunmen attacked a mosque in northwestern Nigeria on Tuesday morning, killing at least 13 people during morning prayers, local authorities said. No one imme