US swimmer Michael Phelps sang the national anthem with his gold medal on the podium after winning the men's 100-meter butterfly final during the London 2012 Olympic Games.
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Michael Phelps of the United States swam the 100 butterfly final.
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Runners passed the Olympic flame on Friday.
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Missy Franklin (left) of the United States and teammate Elizabeth Beisel at the start of the 200-meter backstroke final on Friday.
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The Italian team celebrated after defeating Russia to win the bronze medal in men's sabre team fencing.
Egypt's Khalil K Abir Abdelrahman fell during an attempt in the women's weightlifting competition.
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Latvia's Maris Urtans made an attempt in the shot put.
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From left, Abiodun Oyepitan of Great Britain, Ivet Lalova of Bulgaria, Gloria Asumnu of Nigeria, and Veronica Campbell-Brown of Jamaica competed in the 100-meter event.
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Iryna Kulesha of Belarus won the bronze medal in the women's 75-kg weightlifting competition on Friday.
South Korea's Shin A Lam reacted after being defeated by Germany's Britta Heidemann during the women's epee individual semifinal fencing competition.
A combination picture shows athletes sticking their tongues out during the Games. Top row: (from left) tennis player John Isner from United States, weightlifter Natasha Perdue of Great Britain, and weightlifter Meline Daluzyan of Armenia. Middle row: hurdler David Greene of Great Britain, double trap shooter Peter Robert Russell Wilson of Great Britain, and US swimmer Michael Phelps. Bottom row: shot putter Pavel Lyzhyn of Belarus, weightlifter Junior Sanchez Rivero of Venezuela, and weightlifter Deni Deni of Indonesia.
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Yasuhiro Ueyama of Japan competed on the men's trampoline.
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Brazil's Juliao Henriques Neto (left) battled Puerto Rico's Jeyvier Contron Ocasio during a men's flyweight preliminary boxing match Friday.
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Helen Langehanenberg of Germany kissed her horse Damon Hill after they competed in equestrian dressage.
Belarus' Yana Maksimava landed on the mat after her jump during the heptathlon high jump event.
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Sam Bewley, Marc Ryan, Jesse Sergent, and Aaron Gate of New Zealand revved it up in the team pursuit track cycling qualifying event.
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Germany's Tim Grohmann, Lauritz Schoof, Phillipp Wende, and Karl Schulze celebrated after winning gold in the quadruple sculls.
Croatia's Vesna Milanovic-Litre (left) and Ivana Lovric challenged Montenegro's Ana Dokic in the women's handball preliminaries.
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Lisa Westerhof and Lobke Berkhout of the Netherlands during the 470 women's dinghy race.
Serbia's Asmir Kolasinac put chalk on his shot put during the men's qualification.
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Turkey's Bahar Caglar drove to the basket against China during a women's basketball game on Friday.
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Cuba's Idalys Ortiz celebrated winning her women's judo semifinal match. The picture was taken with a robotic camera.
Brazil's Maria Suelen Altheman battled China's Tong Wen in their bronze medal judo match.
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Nan Zhang (left) and Yunlei Zhao of China celebrated winning the mixed doubles badminton gold medal match against compatriots Chen Xu and Jin Ma of China.
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Sophie Van Gestel of the Netherlands dove for the ball alongside Madelein Meppelink during their women's beach volleyball match with Brazil.
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Tania Cagnotto of Italy took the plunge during the women's 3-meter springboard diving preliminaries.
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Great Britain's Katherine Grainger (left) and Anna Watkins displayed the gold medals they won in the rowing double sculls in Eton Dorney, near Windsor.