WASHINGTON: A federal judge cited repeated government missteps in dismissing all charges against five Blackwater Worldwide security guards accused of killing unarmed Iraqi civilians in a case that inflamed anti-American sentiment abroad.

United States. District Judge Ricardo Urbina dismissed the case against the guards accused of the shooting in a crowded Baghdad intersection in 2007 that left 17 Iraqis dead. The Iraqi government wanted the guards to face trial in Iraq and officials there said they would closely watch how the US judicial system handled the case.

Urbina said the prosecutors ignored the advice of senior Justice Department officials and built their case on sworn statements that had been given under a promise of immunity. Urbina said that violated the guards' constitutional rights. He dismissed the government's explanations as "contradictory, unbelievable and lacking in credibility".