MOSCOW, December 5. /TASS/. The Russian Anti-Doping Agency (RUSADA) will have its own investigation into the cases and persons shown in a documentary at Germany’s ARD channel about doping in Russian sports, the agency’s press service reported on Friday.

The organization will publish results of the investigation on its website.

A documentary, shown by German ARD television channel, said Russian athletes systematically took banned substances as they were being instructed by their coaches.

The film used a recording taken by a cell device, where Olympic champion of 2012 Maria Savinova said she used doping. The film demonstrated a recording, which featured her coach Vladimir Kazarin, who gave a banned substance to another athlete.

Vladimir Kazarin, a former coach of Russian 800-meter runner Yulia Stepanova at the center of a doping scandal, said on Friday that he had never supplied banned substances to athletes.

Stepanova, who was disqualified for doping use for two years from January 2013, accused the Russian Athletics Federation and the Russian Anti-Doping Agency (RUSADA) of concealing numerous cases of doping abuse among Russian athletes and supplying them with banned drugs in Wednesday's interview with German TV channel ARD. Kazarin told TASS that he had "lost faith in people" after Stepanova's accusations.

"I've given no banned substances to anyone. It is strange when a person disqualified for doping starts speaking about the purity of sports," he said.

The coach said that the German TV channel could have paid Stepanova for making such allegations.

The International Association of Athletic Federations (IAAF) earlier said that its ethics commission was investigating the ARD report.