Al-Qaeda's second in command has reportedly appeared in a video marking the September 11 attacks in the United States.
According to the SITE Institute, a US based terrorist monitoring service, Ayman al-Zawahiri appeared in the 106-minute Arabic-language video, entitled "The West ... and The Dark Tunnel".
He and other al-Qaeda figures spoke of events over the past year including the global financial crisis and the election of US President Barack Obama.
The video was posted on websites often used by al-Qaeda supporters.
