The head of an Islamic human rights group says five U.S. men who disappeared from the Washington area recently left behind a disturbing video.
The five men are believed to be under arrest in Pakistan, where officials are investigating possible links to extremism.
Nihad Awad, the head of the Council on American-Islamic Relations, did not describe the video but U.S. officials who spoke on condition of anonymity said the video showed said Muslims must be defended and featured images of American casualties. The officials spoke anonymously because they were not authorized to discuss the case.
After the five men disappeared, family members approached the human rights group, which says it immediately went to the FBI with the information.
Associated Press writer Devlin Barrett contributed to this report.