Armed police officers in London
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Is UK safer now than before 9/11 terror attacks?

7 September 2011 Last updated at 20:13 BST

It is nearly a decade to the day since the shocking images of the 9-11 terror attacks were beamed around the world.

In Britain, the 10 years that followed have seen the London underground atrocities and a huge shake-up of counter-terrorist policing, intelligence and community relations.

Frank Gardner has been assessing whether we are any safer now than we were then.