A new video featuring an introduction from al-Qaeda leader Osama bin Laden appeared on the Internet on Tuesday, CNN reported.

In the tape a voice identified as bin Laden's praises 9/11 Saudi Arabia's hijacker Waleed al-Shehri, who was on board of the plane that crashed into World Trade Center's north tower.

The video, whose authenticity has not been confirmed yet, appeared on the day when the world marks the sixth anniversary of the September 11, 2001, attacks on New York and Washington.

The new tape came just three days after bin Laden has made his first appearance in a video tape in nearly three years, in which he called democracy "bankrupt" and invited Americans to embrace Islam.

Analysts have said bin Laden's reappearance after a long break was a taunt to the US, but also an attempt to re-assert his authority over the movement, which has grown increasingly decentralised in recent years.

Bin Laden is thought to be hiding on the mountainous border between Pakistan and Afghanistan, but has so far eluded all efforts to capture him, prompting the US to double the bounty on his head to USD 50 M in July.

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