London: More than 1,000 Russian athletes competing in summer, winter and paralympic sport were involved in or benefited from an institutional conspiracy to conceal positive doping tests, a WADA report said yesterday.

The second part of a report by Canadian sports lawyer Richard McLaren provided more details of an elaborate state-sponsored doping scheme operated by Russia.

It said there was a systematic cover-up, which was refined at the 2012 Olympics, 2013 world athletics championships and 2014 Sochi Winter Olympics, and that more than 30 sports, including soccer, were involved in concealing positive doping samples.