People walk past a security camera installed outside the Olympic Park that is under construction for the the 2014 Winter Games, in the Black Sea resort of Sochi, Russia, Tuesday, April 16, 2013. Russian sports officials said Tuesday they will beef up security at sports events and the Sochi 2014 Winter Games in the wake of deadly explosions at Boston's marathon that killed three people, and injured over 140 others. (AP Photo/Artur Lebedev)

Associated Press
People walk past a security camera installed outside the Olympic Park that is under construction for the  the 2014 Winter Games, in the Black Sea resort of Sochi, Russia, Tuesday, April 16, 2013. Russian sports officials said Tuesday they will beef up security at sports events and the Sochi 2014 Winter Games in the wake of deadly explosions at Boston's marathon that killed three people, and injured over 140 others. (AP Photo/Artur Lebedev)
People walk past a security camera installed outside the Olympic Park that is under construction for the the 2014 Winter Games, in the Black Sea resort of Sochi, Russia, Tuesday, April 16, 2013. Russian sports officials said Tuesday they will beef up security at sports events and the Sochi 2014 Winter Games in the wake of deadly explosions at Boston's marathon that killed three people, and injured over 140 others. (AP Photo/Artur Lebedev)
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