(KUNA) -- In continued violence in Iraq, four Iraqis were killed Tuesday, over 22 injured, and a child kidnapped. In Kirkuk, two Iraqi civilians were killed and at least 22 injured when a booby-trapped car exploded near a gas station. The cars in the station caught fire as it damaged the surrounding areas. Gas stations have been generally crowded due to the shortages experienced.An Iraqi policeman was killed by an insurgent's gun shot in Kirkuk; he died instantly. Police found a body punctured with stabbing wounds in Domiz. The man was identified as 59 year old Mohammad Awad Fayyad. Also in Kirkuk, according to police sources, militants in two cars were kidnapped a child.