imanidiot's name is appropriate. It's a video of a US helicopter killing four or five of heavily armed insurgents and two unarmed reporters half a mile or so from a running battle, which was subsequently investigated and the investigations findings being published.
The mistake the pilots made was misinterpreting the shape of a long lens with the shape of an RPG. The group had both long lenses and RPGs (and AK rifles). Had they not confused the lens with an RPG, they'd probably have let troops on the group shoot at the insurgents.