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'

The Qatari government set up the Doha Centre for Media Freedom in 2008 to promote press freedom and quality journalism, and is home to the pan-Arab satellite TV network al-Jazeera.

BBC: Qatar urged to free poet Mohammed Ibn al-Dheeb al-Ajami

Al Jazeera has acquired Current TV, the cable television network founded by former US Vice President Al Gore.

BBC: Al Jazeera targets US expansion after buying Current TV