A BBC programme investigating the conspiracy theories of September 11 is expected to prolong speculation that the attacks were perpetrated by the American government.

The investigation into the "mysterious" collapse of the third tower of the World Trade Centre will re-examine questions which an official inquiry was designed to answer.

The 47-storey tower collapsed seven hours after the Twin Towers and has become the subject of heated speculation and a host of conspiracy theories which suggest it was brought down by a controlled demolition.

The final official report on the World Trade Centre is due to be published this month and official investigators are expected to conclude that fire caused the collapse of the third tower.

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La suite sur le site du Telegraph.