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Osama bin Laden pondered the merits of US television news channels as he considered how to extract the best propaganda benefit from the tenth anniversary of 9/11 last year, and concluded that CBS was "close to being unbiased".

But an American-born media adviser for al-Qaeda warned Bin Laden to beware of the broadcasters' "cunning methods" as he described Fox News as a channel in the "abyss" that should "die in anger", CNN as too close to the US government and MSNBC as questionable after it fired one of its most prominent presenters, Keith Olbermann.

In a memorandum made public by the US military's Combating Terrorism Center on Thursday, Bin Laden asked for advice on exploiting the anniversary of the 9/11 attacks.