Afghan sources in Helmand tell CBS News Kabul bureau chief Fazul Rahim that the three slain troops were members of a U.S. Special Forces team overseeing the training and recruitment of Afghan Local Police. The sources say it was one of the police officers who opened fire on his mentors during dinner on Thursday evening. ISAF has not yet confirmed these details.

The Taliban claimed responsibility for the attack, saying the ALP officer behind the shooting had fled the scene and joined the militant group. There were reports in Arabic media that the suspect was the commanding police officer of a local checkpoint, and had personally invited the U.S. Special Forces members to join him and his men for dinner on Thursday.