A car bomb exploded in the northern Iraqi city of Kirkuk on Saturday (July 29), killing at least three people, police said The blast took place near a petrol station in the centre of the city, 150 miles north of Baghdad. Police General Tohran Abdull-Rahman also said 15 people were wounded. The blast damaged a number of cars at the petrol station and streets were showered with debris. Kirkuk's oil wealth is a source of dispute between rival ethnic groups in the city -- Kurds, Arabs and Turkmen -- and it has seen significant violence over the past year or so.