An Iraqi official says four people have been killed and 12 wounded in back-to-back bombings in the northern city of Mosul.

Spokesman Brig. Gen. Khalid Abdul-Sattar says a homicide bomber pushing a cart detonated his explosives about 200 yards away from the police headquarters about 11:15 a.m.

The spokesman says the blast killed a policeman and a civilian and wounded six other people.

Abdul-Sattar says a parked car bomb exploded about 30 minutes later as a police patrol passed elsewhere in the city, killing two passers-by and wounding six other people.

Wednesday's bombings are the latest in a spate of attacks that have raised fears that Al Qaeda in Iraq is regrouping in northern Iraq despite recent security gains.