Eight Iraqi soldiers, including an officer, have been killed and another solider was injured in an ambush by unknown gunmen against an Iraqi Army patrol in western Iraq’s Anbar province on Tuesday.Voice of Iraq news agency quoting security sources, reported that a group of unknown gunmen, dressed in military uniform, have set up an ambush in Haditha city. The city is 280 km west of Ramadi which is the center of west Iraq’s Anbar Province.Iraqi Army and Police force have opened a broad investigation, searching for the attackers who had escaped for an unknown destination.