UPDATE 1: Video refers to past year's events, including global financial crisis.
Al Qaeda's number two Ayman al-Zawahri appeared on Tuesday in an apparent new video marking the Sept. 11, 2001 attacks against the United States, according to the SITE Institute, a US-based terrorism monitoring service.Zawahri appeared in the 106-minute Arabic-language video, entitled "The West ... and The Dark Tunnel," SITE said.
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.
On Sept. 14, al Qaeda leader Osama bin Laden warned the American people over their government's close ties with Israel in an apparently new audio tape posted on an Islamist website.
The message, entitled "A statement to the American people", was around 11 minutes long and was posted a few days after the eighth anniversary of the Sept 11, 2001 attacks.
The leader of the group that mounted the Sept. 11 attacks is thought to be in hiding in the mountainous terrain along the Afghan-Pakistani border.