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9/11 Conspiracy Theories and the 10th Anniversary
It may be 10 years since the attacks in the US on 11 September, but conspiracy theories have not faded over time, says Mike Rudin.
Numerous official reports have been published since the Twin Towers fell, but just when a piece of evidence casts doubt on one theory, the focus then shifts to the next "unanswered question".
Here are five of the most prominent 9/11 conspiracy theories circulating in online communities.