WASHINGTON (CNN) -- Navy investigators have determined a U.S. Marine acted in self-defense when he shot an apparently wounded and unarmed Iraqi inside a Falluja mosque in November, a senior Pentagon official said Wednesday. The Marine corporal, who will not face charges, was under investigation in the shootings of four enemy combatants as part of an operation during the siege of Falluja on November 13, 2004. The mosque shooting was captured on videotape by an embedded reporter. [...] Although that Marine has been cleared of wrongdoing, the investigation remains open because autopsies of some of the bodies found in the...