US lawmaker John Murtha today renewed his explosive charge that US soldiers killed unarmed civilians in Haditha, Iraq and the US military tried to cover it up. "This is what worries me. We're fighting a war about America's ideals and democracy's ideas and something like this happens, they try to cover it up," Pennsylvania Representative Murtha told CNN television. "It is as bad as Abu Ghraib, if not worse," Mr Murtha said. Two separate US military investigations are under way into the killings in November of some 24 unarmed civilians in Haditha. "They knew the day after this happened that...