The second part of the report on the alleged doping abuse in Russia was released by the World Anti-Doping Agency's (WADA) commission led by Canadian law professor Richard McLaren.

The second part of McLaren's report contains investigation materials comprising over 1,000 testimonies, including letters and results of tests.

The report claimed that more than 1000 Russian athletes across 30 sports were involved in doping manipulations or benefitted from them.

"It was a cover up an unprecedented scale and the second part of this report shows the evidence that increases the number of athletes involved as well as the scope of the conspiracy and cover up," the report said.

Doping samples of 12 out of 44 medalists, including 3 gold medalists, at Sochi Olympic Games were opened.