SYDNEY (AP) — An Australian newspaper says 23 Chinese swimmers were cleared to compete at the Tokyo Olympics despite testing positive to doping because world governing bodies agreed with Chinese authorities and ruled that the tests had been contaminated.

The Daily Telegraph in Sydney said Saturday that the swimmers tested positive for trimetazidine, a heart medication, at a training camp held months before the start of the 2020 Tokyo Games, which were delayed until 2021 due to the COVID-19 pandemic.

Chinese anti-doping authorities found the results of the tests were Adverse Analytical Findings (AAF) but cleared the swimmers without any penalties after finding that the samples were flagged as positive as a result of contamination.

The 30-member Chinese swim won six medals in Tokyo, including three golds.

The newspaper said that the World Anti-Doping Agency (WADA) and World Aquatics — then called FINA — were both notified of the positive samples but that both groups agreed the results of the tests were caused by contamination and did not sanction any of the athletes who tested positive.