14% support 9/11 conspiracy theory
More than one in 10 people in the UK are convinced that the American government was involved in a conspiracy to stage the September 11 attacks.
A poll carried out for BBC Two found that 14% of Britons think the US administration was involved in the atrocity, which killed nearly 3,000 people.
They were asked: "It is generally accepted that these attacks were carried out by al Qaida. However some people have suggested there was a wider conspiracy that included the American government. Do you, yourself, believe that there was a wider conspiracy, or not?"
The belief that there was a conspiracy was more common among younger people, with a quarter (24%) of 16 to 24-year-olds subscribing to the theory.
Around two thirds of those polled, 68%, said there was no conspiracy.
The survey was carried out for a BBC documentary which examines why so many people believe there is a darker truth behind the attacks.
Even in the US, 15% of those asked believed that there was a government conspiracy.
This is despite a series of official inquiries which have found no evidence to support the claim.
The survey was carried out by Gfk NOP as part of a BBC Two programme, The Conspiracy Files - Ten Years On.
Telephone polls in the UK and the US - each of 1,000 adults - were carried out last month.