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Essex Police on standby for Olympics venue in Hadleigh

17 July 2012 Last updated at 14:58 BST

Essex Police have been put on standby for the Olympic Games mountain-biking venue at Hadleigh amid concerns over security cover.

But it not not the only Olympic site hit by problems. The BBC has been told G4S could provide only 12 of the 60 security guards needed at the Lee Valley White Water Centre in Hertfordshire.

Sally Chidzoy reports.