Three car bomb attacks in 30 minutes in the northern Iraqi city of Kirkuk have left at least 20 people dead and 70 wounded, Kirkuk police said. The victims were police and civilians, officials said. The first attack, carried out by a suicide car bomber, took place at 10 a.m. on Sunday near the criminal investigation division of Kirkuk's police building, police said. Ten minutes later, a suicide car bomber detonated outside a building housing an organization for children, and 20 minutes after that, a parked car bomb exploded outside a mosque, police was quoted as saying by CNN. Kirkuk is 380 kilometers (235 miles) north of Baghdad.