Gunman in Afghanistan forces uniform kills 3 American troops in Helmand province

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.