Olympic Stadium

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**FILE** South Africa's Oscar Pistorius embraces Grenada's Kirani James after the men's 400-meter semifinal during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Anja Niedringhaus)

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Workers adjust a sign outside the Olympic Stadium in London on Monday, Aug. 13, 2012, to prepare for the upcoming Paralympic Games. (AP Photo/Matt Dunham)

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Fireworks soar over the Olympic Stadium as the flame is lowered Sunday during the closing ceremony for the 2012 Summer Games in London. The torch was passed to Rio de Janeiro for the 2016 Games. (Associated Press)

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The Olympic flame burns as spectators gather in Olympic Stadium to attend the closing ceremony of the 2012 Summer Olympics on Sunday, Aug. 12, 2012, in London. (AP Photo/Hassan Ammar)

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Great Britain's Mohamed Farah shows off his gold medal to his stepdaughter Rihnna after the awards ceremony for the men's 5000-meter during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Saturday, Aug. 11, 2012. (AP Photo/Matt Slocum)

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United States' women's 4 X400-meter relay team from left, Francena McCorory, Allyson Felix, Sanya Richards-Ross and Deedee Trotter celebrate after winning the gold medal during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Saturday, Aug. 11, 2012. (AP Photo/Anja Niedringhaus)

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South Africa's Oscar Pistorius takes the baton from teammate L J van Zyl during the men's 4x400-meter during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. (AP Photo/Matt Slocum)

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Bahamas's Ramon Miller leads USA's Angelo Taylor during the final leg of the men's 4x400-meter during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. (AP Photo/Matt Slocum)