(CNN) -- A new video purportedly featuring an introduction from al Qaeda leader Osama bin Laden appeared on the Internet Tuesday, the sixth anniversary of the September 11, 2001, attacks on New York and Washington. In the video's introduction, a voice identified as bin Laden's praises 9/11 hijacker Waleed al-Shehri, from Saudi Arabia. He sat in seat 2B on American Airlines Flight 11, which crashed into World Trade Center's north tower.
The authenticity of the video was not immediately confirmed.