The Badminton World Federation has disqualified eight players after accusing them of "not using one's best efforts to win". Four pairs of players - two from South Korea and one each from China and Indonesia - are out of the Olympics after their matches on Tuesday.

The eight were charged after a stream of basic errors during the match.

Top seeds and world champions Wang Xiaoli and Yu Yang from China were among the four pairs expelled over charges of throwing matches to secure an easier draw in next round.

The federation met on Wednesday morning to discuss the case. As well as the "not using best efforts" charge, the players were also accused of "conducting oneself in a manner that is clearly abusive or detrimental to the sport".

Wang and Yu and their South Korean rivals Jung Kyun-Eun and Kim Ha-Na were jeered and booed by the crowd on Tuesday after hitting serves into the net and striking easy shots long or wide.

The umpire and the referee warned the all four players, but the situation didn't change. The Chinese women eventually lost 21-14, 21-11 and as a result they won't meet compatriots until the final.

The farce was repeated in the next women's doubles between South Korea's Ha Jung-Eun and Kim Min-Jung and Indonesia's Meiliana Jauhari and Greysia Polii. Both teams were also warned for deliberately trying to lose.