A police officer with a sniffer dog and security guards check a bus entering the Olympic Park that is under construction for 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
A police officer with a sniffer dog and security guards check a bus entering the Olympic Park that is under construction for 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)
A police officer with a sniffer dog and security guards check a bus entering the Olympic Park that is under construction for 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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