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G4S worker's concern over Olympic security measures

18 July 2012 Last updated at 13:14 BST

A whistleblower at G4S told BBC Radio 5 liveBreakfast's Nicky Campbell he has serious security concerns about the Olympic site he is working at.

The man, whose words have been voiced by an actor because he wants to keep his identity secret, said a guard failed to spot an x-ray image of a nail bomb.

The company insists training for every role is rigorous.

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