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'20th hijacker' of 9/11 sent back to Saudi Arabia

Teacher suspended over use of Bin Laden image

Officers condemn CIA torture as a stain on America

The prison staffed by inmates released by the Taliban. Video, 00:02:53The prison staffed by inmates released by the Taliban

The Taliban are back – will al-Qaeda follow? Video, 00:04:59The Taliban are back – will al-Qaeda follow?

Queen tells Biden 9/11 victims are in her prayers

How social media has propelled 9/11 conspiracies

Al-Qaeda, the Taliban and the binding pledge

Dorset photographer's recollection of September 11th attacks, 20 years on. Steve Harris. Audio, 00:03:57Dorset photographer's recollection of September 11th attacks, 20 years on

The threat of al-Qaeda haunts Afghanistan pull-out

Fewer boots: Radical rethink in fighting insurgencies

Critical stage for fight against jihadis in West Africa

Witness History. The battle of Tora Bora. Audio, 9 minutesWitness History

Witness History. The Nairobi US Embassy bombing. Audio, 9 minutesWitness History

The US embassy blast victims who fear being forgotten

Witness History. Meeting Osama bin Laden. Audio, 9 minutesWitness History

Islamic State tries to shore up relevance with Iraq carnage

Iran is al-Qaeda's 'new home base' - Pompeo

FBI accuses man of al-Shabab-led '9/11-style' plot