Five members of a private security detail working for Moyock, NC based Blackwater USA were killed Tuesday when their helicopters came under attack while protecting an American convoy. A senior Iraqi military official said the helicopter had been shot down, but this was disputed by a U.S. military official in Washington.

Also in dispute is how the crew members died. Fox News is reporting this morning that according Iraqi officials, 4 of the 5 crew members were shot execution style in the back the head after they went down in a dangerous Sunni neighborhood in central Baghdad.

The insurgency group, Ansar al-Sunnah had earlier claimed downing the Blackwater helicopter and had produced personal documents allegedly taken off one of the dead crew members as evidence. This video was posted by another Sunni insurgency group, the 1920 Revolutionary Brigades.