A fourth man has been arrested by detectives investigating allegations that Tottenham spied on Olympic officials during its stadium bid. The 45-year-old 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, police said.
Spurs have denied putting officials under surveillance but West Ham's deal with Newham Council to use the stadium after the 2012 Games collapsed in October and it is now back in public ownership.