London 2012: The biggest controversies

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Olympic Games tend to generate controversies and London 2012 was no exception.

Cycling
Philip Hindes admitted to deliberately crashing before propelling Great Britain to team pursuit glory but the IOC and International Cycling Union said the gold medal would stand. The 19-year-old's admission appeared to be naive but not a contravention of the rules. Hindes fell after making a wobbly start in qualifying before picking himself up to help Britain to two world record rides as Sir Chris Hoy and Jason Kenny successfully defended their title.
Hindes: I crashed on purpose
Badminton
The Olympic badminton competition was hit by a match-fixing scandal when eight players were kicked out for deliberately trying to lose. Two Chinese players, four from South Korea and two from Indonesia all tried to fix their matches to manipulate the women's draw in front of angry fans. All four pairs had already qualified for the last eight and were trying to avoid meeting the favourites.
Four badminton pairs disqualified
Hidayat shocked by badminton fiasco
Yu quits after Olympic scandal
IOC to investigate badminton coaches
Swimming
Rumblings over the remarkable performance of Chinese teenager Ye Shiwen changed to overt suspicion when a leading American coach described her world-record breaking race as "disturbing". John Leonard, the executive director of the World Swimming Coaches Association questioned how the 16-year-old (below), who took five seconds off her personal best and more than a second off the world record in the 400m individual medley. The IOC insisted there was no reason to question her performances.
Doubts cast on Ye Shiwen's exploits
FINA hit out against Ye allegations
Phelps believes in new swim star Ye
Ye gains support over suspicions
Fencing
South Korean fencer Shin Lam thought she was through to the final of the women's epee when, to her horror and that of her coach Shim Jaesung, the clock was reset from zero to one second. When the action resumed German Britta Heidemann scored a do-or-die hit that gave her a place in the final against Ukraine's Yana Shemyakana. Shin broke down in tears and refused to leave the piste for two hours before eventually conceding defeat.