MAIDUGURI, Nigeria — Female suicide bombers targeted a wedding, a funeral and a hospital in coordinated attacks in northern Nigeria that killed at least 18 people, local authorities said Sunday.

The first suicide bomber detonated an explosive device during a marriage celebration in the northeastern town of Gwoza at about 3 p.m., Barkindo Saidu, director-general of Borno State Emergency Management Agency, told reporters.

“Minutes later, another blast occurred near General Hospital,” Saidu…