The governor of a northeast Nigeria state has put a city under curfew after a series of bombings and shootings there likely carried out by the radical Islamist sect Boko Haram.

Yobe state Gov. Ibrahim Geidam announced on Monday a 4 p.m. to 7 a.m. curfew for Potiskum, a city where attacks have been going on since Thursday. Hospital records show at least 23 people had been killed as of Saturday.

Overnight Sunday, authorities said gunmen killed a state government official and his two children. Witnesses said gunmen also burned down three schools and threw a bomb at a military convoy. A military spokesman said two soldiers were wounded.

Geidam blamed the attacks on "criminal gangs." However, the attacks mirror others carried out by Boko Haram.