Report: U.S. crew of downed helicopter shot at close range

Blackwater helicopters participate in a joint U.S. military operation in Baghdad on Tuesday.

Story Highlights•Americans in chopper crash were shot execution style, Iraqi and U.S. officials say
•A senior Iraqi military official says helicopter was shot down out of sky
•A U.S. defense official says uncertain if Americans were still alive when shot
•There are three separate claims of responsibility in the helicopter crash

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