A suicide car bomb hit a major police station in the northern city of Mosul Thursday, killing 12 people and wounding 25, many of them motorists waiting to buy gasoline at a nearby gas station, police said.
Authorities imposed an indefinite curfew after the attack on Abi Tamam police station at 7:15 am (04:15 GMT). Police fired into the air in several parts of the city, forcing motorists and pedestrians to scurry for cover.
The northern cities of Mosul and Kirkuk have seen a significant increase in violence in recent weeks as US troops focus on crushing insurgent and militia activity in the center of the country, especially in the capital and its environs.
In Baghdad, police said at least four people were killed and 13 wounded when a pair of roadside bombs went off in the capital's southern Dora district.