31 July 2012 Last updated at 21:56 ET
The Badminton World Federation has charged eight female badminton Olympic players with "not using one's best efforts to win a match".
Four pairs of players - two from South Korea, one from China and one from Indonesia - could be disciplined.
China's Yu Yang and Wang Xiaoli and South Koreans Jung Kyung-eun and Kim Ha-na were accused after their match was booed by spectators.
Both pairs, who played each other, were already through to the quarter-finals.
