Chinese swimmer has tested positive

Chinese swimmer Chen Xinyi has failed a doping test at the Rio Olympic Games, the Chinese Swimming Association announced in Beijing on Friday morning.

The 18-year-old tested positive for hydrochlorothiazide, a diuretic, on Sunday, after she finished fourth in the 100m butterfly final.

Diuretics increase urination and can be used to hide the presence of performance-enhancing substances that are screened for in doping tests.