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Associated Press
RAF Typhoon fighter aircraft at RAF base Northolt, where four of the aircraft will be based as part of the Olympics related security exercise in west London, Wednesday, May 2, 2012. The Typhoon interceptor aircraft forms a part of a co-ordinated defence against possible threats to the London 2012 Olympic games, involving all three of the British armed services, with high end weaponry including a missile defence system, fighter aircraft and AWACS aircraft. (AP Photo/Alastair Grant)

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