...in the AP we have

A U.S. official had said earlier that counterterrorism officials believed the new audiotape attributed to bin Laden is probably authentic. "It's probably his voice," said the official, speaking on the condition of anonymity. "It cannot be said with absolute certainty."


Hmm...I remember reading something about [link|http://z.iwethey.org/forums/render/content/show?contentid=69981|unnamed sources] a while back.