A security exercise has been undertaken in London to prepare for this summer's Olympics and Paralympics.
Emergency services, including police, firemen and paramedics were among 2,500 personnel to take part in the event, which took place at the disused Aldwych underground station.
Titled Exercise Forward Defensive, the operation was intended to test out London's preparation for the Games, which has included the installation of security fencing
at venues around the capital.
Surrey Street was also closed to traffic as mock passengers were evacuated from the Tube.
Chris Allison, officer in charge of Olympic security and the Metropolitan Police assistant commissioner, said: "We need to be confident that we have the right people in the right places, that we understand how others operate and that we are talking to each other at the right levels and in the right way."
Around 17,000 athletes are expected to take part in the Games, with 500,000 spectators attending and 63,000 involved in the staging process.
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