Holy shit, that's pretty fuckin' epic.
I'm sure you've heard of "Collateral Murder", it is a video released by WikiLeaks that showed US solders killing 2 Canadian reporters after mistaking a camera for an RPG.
At 2:05 they fire a bunch of bullets at a group of people, all but one survived (Canadian reporter, you can see him at 5:03), then the soldiers anxiously wait for him to pick up a weapon (which in law it would be legal to kill), he was later shot down when a group of people with a van come and pick him up at 7:05, the soldiers shoot the van which included children as well.
VIDEO: http://upload.wikimedia.org/wikipedia/commons/6/61/CollateralMurder.ogv
INFORMATION: July 12, 2007 Baghdad airstrike - Wikipedia, the free encyclopedia