Al-Jazeera, which is based in Qatar, said the new tape is from bin Laden.

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One item on the laptop that was cited by Kohlmann linked to a YouTube video of a 2009 CNN report featuring the network's national security analyst, Peter Bergen, talking about a newly released audio tape from Osama bin Laden.

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In one of such sessions, together with his doctoral student Konstantin Novoselov, he used a piece of ordinary sticky tape (which allegedly they found in a bin) to peel off a very thin layer of graphite, taken from a pencil.

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Last week, US intelligence experts said technical analysis of another audio tape aired on the al-Jazeera satellite TV network showed "almost certainly" that it came from Bin Laden.

BBC: 'Bin Laden' tape attacks 'crusaders'