Olympics bosses have ordered an inquiry into alleged "improper conduct" involving the bidding process for the 2012 Games.
According to a BBC documentary, promises were made that the votes of some of the 124 voting members of the International Olympic Committee could be secured for cash.
The IOC, which will decide whether to give the 2012 Games to London or one of the other shortlisted cities, has referred the matter to its ethics commission.
The BBC's
Panoramaprogramme will report next week that at least one IOC member flouted strict rules on the selection process for the 2012 Games.
Undercover reporters for the programme posed as consultants acting for clients with business interests in east London who were keen to see the Olympics come to the capital.
Professional agents promised to secure the votes of some IOC members in exchange for money, according to
Panorama.
London's 2012 Olympic bid Chairman Lord Coe distanced the capital's bid team from the allegations yesterday. It is not believed the programme found any impropriety on behalf of the London bid team.
But it is thought that an IOC member acted outside the strict regulations for accepting gifts which the IOC imposed following the Salt Lake City votes scandal.
London 2012 chief executive officer Keith Mills has written to the IOC enclosing copies of correspondence between the bid team and the
Panoramaproducers which "reaffirmed the bid's total commitment and adherence to the ethical rules of the IOC".