WADA president Craig Reedie was disturbed by allegations of orchestrated doping in Russian swimming.

First Russia, now the World Anti-Doping Agency (WADA) is investigating Chinese swimming over claims that five drugs tests were covered up.

The Times has reported that five tests take from Chinese athletes had been hidden to avoid a storm before the Olympic trials next month.

Two of the tests were believed to have been failed in October and the other three at the turn of the year.

The accusations come a day after WADA and and FINA, the sport's governing body, vowed to look into the extent of doping in Russian swimming, which was also revealed by the British daily.

The Times alleged that doping and cover-ups took place over several years in Russian swimming.

Some of the claims were linked to sports doctor Sergei Portugalov, who WADA wants banned for life after his role in a doping conspiracy in athletics was detailed in November. That WADA-commissioned inquiry led to Russia's track and field team being banned from international events nine months before the Rio Olympics.

"There is no doubt that today's disturbing assertions of orchestrated doping in Russian swimming should be scrutinised," WADA president Craig Reedie said in a statement.