Four Iraqis, including two policeme, were killed and at least 20 others wounded Monday in separate incidents of violence in Nineveh and its center Mosul and Kirkuk in northern Iraq. A source in the Iraqi police in Mosul told Kuwait News Agency (KUNA) that unknown gunmen carried out an attack on a police checkpoint in Hamam Al-Aleel area south of Mosul, killing one of its elements. The source added that unidentified gunmen opened fire with automatic weapons toward a civilian near his home in Shoura area south of Mosul, killing him on the spot. It said a suicide bomber was wearing an explosive belt blew himself up near an army checkpoint in the Karama neighborhood in eastern Mosul, wounding four soldiers and a civilian. In another security incident, a Kirkuk police source said that a booby-trapped car parked on the side of a road in the neighborhood of Wasti south of Kirkuk exploded as a police patrol emergency vehicle was passing by, killing one and wounding 15 others.