A new video said to be of elusive Al-Qaeda chief Osama bin Laden contains references suggesting it was made recently, US media reported on Friday.
CNN reported that a senior official told the network that the video "contains no overt threats but does contain several date references, including one that, if confirmed, would indicate the tape is new."
"It's quite possible this is a new video," a CIA spokesman also told ABC News.
US services that monitor militant websites announced late on Thursday that bin Laden was set to appear in a new video to be released to mark Tuesday's sixth anniversary of the September 11, 2001 attacks.
The Al-Qaeda network's media arm, as-Sahab, announced the video in a notice posted on jihadist forums at about 2115 GMT, according to the SITE intelligence group.
US government officials confirmed on Friday that they were studying the video to see if it was authentic.
It would be bin Laden's first such appearance since October 2004, when he threatened new attacks against the United States just days before US elections.
Bin Laden, wanted for the 2001 attacks blamed on Al-Qaeda, has evaded capture by US authorities despite a 25-million dollar bounty on his head.