MI5 boss and former PM Tony Blair on 9/11 anniversary - a podcast by BBC Radio 4

On the eve of the 20th anniversary of 9/11, Director General of the security service MI5 Ken McCallum spoke to Mishal Husain about the event and its impact on the world. Today's Justin Webb is in New York and reports on how the events of that day have changed America. Justin Webb also spoke to former prime minister Tony Blair, who's in New York to mark the occasion, about what has been achieved in the 20 years following the attack.

Image: 9/11 Tribute in Lights on 10th anniversary of attacks, Credit: Reuters

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