Washington: A US Marine sergeant is under investigation for possible war crimes committed in Iraq based on statements he made to his hometown newspaper, military officials said today. Gunnery Sergeant Gus Covarrubias became the target of the preliminary inquiry after he described for the Las Vegas, Nevada, Review-Journal daily how he had hunted down and shot two Iraqi soldiers after a firefight. "A preliminary inquiry has been initiated by the Naval Criminal Investigative Service to examine the circumstances surrounding the statements made by Gunnery Sergeant Covarrubias," the statement said. "The preliminary inquiry will determine if the actions described by Gunnery...