Matukio ya kusisimua ya riadha Olimpiki 2012

Usain Bolt celebrates winning gold alongside silver medalist Yohan Blake, both of Jamaica, following the men's 100-meter final.

Usain Bolt also won the men's 200m final on Thursday.

Germany's Robert Harting celebrates winning the men's discus throw final by grabbing a German flag, running a lap of the track over the hurdles, and trying to wrench one of the burning torches from the Olympic cauldron.

Ashton Eaton, a 24-year-old from Oregon, wins in the men's decathlon 100m heat. Brazil's Luiz Alberto de Araujo is on the left, and Oleksiy Kasyanov of Ukraine on the right.

Dayron Robles (center), of Cuba, pulls up after injuring his leg while competing with Aries Merritt (L) and Jason Richardson of the U.S. during the men's 110m hurdles final.

Sarah Attar, the first woman from Saudi Arabia to compete in Olympic track and field, runs in her women's 800m round 1 heat.

China's Liu Xiang falls after hitting a hurdle in his men's 110m hurdles round 1 heat, clutching the same right Achilles tendon that doomed his chances at the Beijing Games in 2008.

Australia's Sally Pearson won gold in the women's 100m hurdles final.

Congolese soldiers guard suspected M23 rebel fighters who surrendered in Chanzo village near the eastern town of Goma, Nov. 5, 2013.

Lolo Jones of the U.S. clears a hurdle with Canada's Phylicia George. Jones is the American record holder in the 60m hurdles with a time of 7.72. She came in fourth in the 100m hurdles final in London.

Aries Merritt of the U.S. celebrates after winning gold in the men's 110m hurdles final.