Olympic organizers keep a close eye on safety

British soldiers check a badge at the gate to the Olympic Park in London on July 23, 2012. A security force of more than 40,000 military and civilian personnel, backed by a huge intelligence operation, is turning the British capital into a fortress to protect venues, athletes and millions of visitors during the 2012 Olympic Games.

A Royal Air Force Puma helicopter flies over the 2012 Olympic Stadium during a training flight in London on Aug. 18, 2011. Preparations for the Olympics -- and the security measures that accompany the Games -- have been going on since 2005.

Military and civilian security staff working side-by-side to provide security for Olympic venues, in London on July 24, 2012.

Members of the British military install a missile battery on the roof of the Fred Wigg building in east London on July 13, 2012, as part of the defenses for the London 2012 Games.

Soldiers look through a Starstreak high velocity missile (HVM) system, which is playing a role in providing air security during the Olympics, at a photocall in Blackheath, southeast London, on May 3, 2012.

A security camera is placed on a lamp post near the Great Westminster clock, better known as Big Ben, next to the Houses of Parliament, in London on July 23, 2012.

A police boat takes part in a combined Police and Royal Marines security exercise for the London 2012 Olympic Games on the River Thames in London on Jan. 19, 2012.

A Metropolitan Police officer rides the escalator toward Westfield Shopping Center just outside the Olympic Village in east London on July 24, 2012.

A member of security staff and a sniffer dog check a vehicle as it enters the Olympic Park site on July 18, 2012, in London. A failure by the security firm G4S to provide their contracted number of security staff to guard Olympic venues has resulted in 3,500 extra troops and additional police officers being deployed to meet the shortfall.

Metropolitan Police officers cross the bridge connecting Stratford Station to Westfield Shopping Center near the Olympic Park in London on July 24, 2012. Not normally seen with side arms, let alone the MP5 semi-automatic weapons seen here, the officers said that the public's reception of them with the weapons has generally been good.

Soldiers man a security checkpoint at an entrance to the Olympic Park at Stratford in London on July 12, 2012. Britain's interior minister had to answer questions in parliament after admitting that she was putting extra troops on standby for Olympic security, just two weeks before the London Games begin, because a private contractor might not meet its commitments.

Indian shooting team member Sanjeev Rajput holds his laptop as he goes through a security check at the Welcome Center near the Athletes' Village at the Olympic Park, Wednesday, July 18, 2012, in London.

A police seal is seen on a drain close to the gates of the Weymouth & Portland National Sailing Academy venue which will host the Olympic sailing events, on July 20, 2-12, in Weymouth, England. The waters of Weymouth Bay and Portland Harbor will host the Olympic sailing events.

A British soldier wearing the emblem of the 2012 London Olympics stands watch as the media enters the Olympic Park in London on July 21, 2012.

British Army Private O'Neal Prempeh keeps a watchful eye on the gate leading into the Olympic Village, in London on July 24, 2012.