Russia's participation in the Rio Olympics remained in the balance on Tuesday after the International Olympic Committee (IOC) said it would 'explore legal options' for banning the country from the Games.

At an emergency IOC Executive Board meeting in Switzerland, the day after an independent report detailed a systematic and state-run doping program in Russia, members fell short of an immediate ban but they did issue a series of measures relating to the report.

"With regard to the participation of Russian athletes in the Olympic Games Rio 2016, the IOC will carefully evaluate the IP Report," a statement said.

"It will explore the legal options with regard to a collective ban of all Russian athletes for the Olympic Games 2016 versus the right to individual justice.

It added that the committee would have to take into consideration the Court of Arbitration for Sport (CAS) decision due on Thursday concerning the IAAF rules, as well as the World Anti-Doping Code and the Olympic Charter.

CAS is due to rule on the dispute between Russia, 68 of its athletes and the governing body of world athletics over their Rio participation after the IAAF banned the country from the Rio track and field program.

The report, commissioned by WADA and compiled by Canadian lawyer Richard McLaren, on Monday revealed evidence of widespread state-sponsored doping by Russian sports men and women and extensive cover-ups, particularly in the 2014 Winter Olympic Games in the Russian city of Sochi.

Positive tests were covered up and "dirty" urine samples swapped with "clean" ones with methods developed by the domestic intelligence service (FSB), while deputy sports minister Yuri Nagornykh decided which athletes would be protected.

The IOC said on Tuesday it had started disciplinary action against officials mentioned in the report and that anyone implicated would not be given accreditation for Rio.

Given the report's details of extensive cover-ups of positive tests in Sochi, the IOC has ordered the immediate re-testing of all Russian athletes who took part, as well as a full enquiry.

It also instructed all international Winter Olympic Winter Sports Federations to freeze their preparations for major events in Russia.

It also said it would not back the European Games, scheduled for the country in 2019.

(By Brian Homewood; Additional reporting by Mitch Phillips, editing by Angus MacSwan)