There apparently was a video posted on an Islamic web site today which shows the bodies of the two American soldiers who were kidnapped and murdered last month. The audio states that these two soldiers were killed in retaliation for the rape and murder of a 15 year-old girl and her family as the family was killed by members of the same regiment.
This is most likely complete bullshit. The rape story didn't become public until after the two soldiers were killed, and given the stigma surrounding rape in the Islamic culture, it's highly unlikely the family would have gone around telling people about it. It's pretty obvious that the audio was added at a later date to take advantage of the situation, pure propaganda.
No, these two soldiers were killed along with one other who died at the initial attack scene because the opportunity presented itself. Somebody screwed up and these three were left alone to guard a checkpoint, nothing more.