Fox is reporting that Al Jazeera is playing an audio tape purportedly of Osama bin Laden making threats about attacks in America.
The tape has not been authenticated by Fox yet.
UPDATE: Here's the story.
The FBI is in the process of authenticating.
UPDATE 2: Michelle Malkin is rounding up some links on bin Laden's resurfacing.
Fox is reporting that intelligence folks studying the tape say it has more detail than other bin Laden tapes have had, and that it may be a new tape, as opposed to a release of an old one.