London 2012: Fourth arrest over Spurs spy claims
A fourth suspect has been arrested by detectives investigating allegations that Tottenham Hotspur spied on Olympic officials during its stadium bid.
Police said a 45-year-old man was being held at a south London station on suspicion of fraud after his property was searched.
West Ham United and the Olympic Park Legacy Company allege information was unlawfully obtained, the force said.
Spurs has denied putting officials under surveillance.
The club had lost out to West Ham in the race to become the Olympic Park Legacy Company's (OPLC) first choice to move into the stadium after the 2012 Games.
A deal with West Ham and Newham Council to use the stadium in Stratford, east London, collapsed in October.
The government announced that the stadium would instead remain in public ownership.
London 2012 - One extraordinary year
Challenges by Tottenham and Leyton Orient, plus an anonymous complaint to the European Commission, had led to fears that court action could drag on for years while the stadium remained empty.
A new tender process is being launched by the OPLC and the showpiece venue will now remain in public ownership and rented out to an anchor tenant.
Three other men, aged 29, 39 and 57, have been arrested in recent months during the inquiry by the Metropolitan Police's Economic and Specialist Crime Command.
They have been bailed to return to a south London police station in February, police said.