A U.S. counterterrorism official says U.S. intelligence agencies have no reason to doubt the authenticity of the audiotape.
The speaker also says that no one held by the United States at the Guantanamo Bay prison for terrorist suspects was involved in the events of September 11.
(compiled from agency reports)
RFE/RL Afghanistan Report
SUBSCRIBE For regular news and analysis on Afghanistan by e-mail, subscribe to "RFE/RL Afghanistan Report."