An Islamist Web site said on Thursday it would carry a new video from Al-Qaeda leader Osama bin Laden in which he declares war on Pakistani President Pervez Musharraf and the Pakistani army.
It gave no details and the video was not available immediately on the site that carried the scrolling headline.
It was not clear when the video might appear. Bin Laden last appeared in a video on Sept. 7, saying in his first appearance for almost three years that the United States remained vulnerable despite its power.
The Saudi-born militant also appeared in an audiotape on September 11, praising the 19 hijackers who carried out the attacks on New York and Washington six years ago.
Officials announced on Thursday that US-allied Musharraf would seek re-election on October 6 despite legal challenges in the Supreme Court and slumping popularity.
The outcome of the mounting political and constitutional crisis is of keen interest to the United States, which has counted on Musharraf's support to guarantee the success of Western intervention in Afghanistan and the war against Al-Qaeda.
Bin Laden is believed to be hiding in the border area of Afghanistan and Pakistan, a mountainous, inaccessible region that US intelligence has described as a safe haven for Al-Qaeda.