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Tony Blair talks about the impact of 9/11

10 September 2011 Last updated at 06:25 BST

Former Prime Minister Tony Blair has spoken to the BBC's Jon Sopel about the events of 9/11 and how they changed the world.

On 11 September 2001, Tony Blair was preparing to make a speech at the TUC conference in Brighton when he was told about events in New York.

He said that 10 years on the world is "safer in a sense" and a lot had been learned about dealing with the terrorist threat.