Updated

A witness and an official say assailants have bombed a police outpost and station in two northern Nigerian cities.

Salisu Ado, who lives near the outpost, said a blast occurred at around 6 p.m. Tuesday in Damaturu, a northeast Nigerian city that suffered multiple attacks last week.

Yobe state police chief Patrick Egbuniwe said security forces were fighting back gunmen in Damaturu.

He could not immediately say if anyone was hurt or what had been targeted.

Police say some 40 people died last week in Damaturu in attacks blamed on a radical Islamist sect known as Boko Haram. They hit 13 targets.

Meanwhile, Nigerian Red Cross official Andronicus Adeyemo said assailants bombed a police station Tuesday evening in Kano, Nigeria's second-largest city. There was no immediate word on casualties there.