Police have arrested a fourth suspect as they continue to investigate claims Tottenham spied on Olympic officials.
Baroness Ford, chair of the organisation initially charged with choosing the Olympic Stadium's tenants, alleged in November that private investigators hired by Spurs had spied on all 14 members of her board.
Tottenham deny the accusation, while the latest arrest of a 45-year-old man means four people have been now been questioned by detectives.
Three other men, aged 29, 39 and 57, have previously been arrested by the Metropolitan Police's Economic and Specialist Crime Command.
West Ham and Newham Council won the right to use the Stratford arena after this summer's Games only for a deal to collapse late last year against the backdrop of ongoing legal action by Spurs and Leyton Orient.
The Government announced the stadium would remain in public ownership and asked the Olympic Park Legacy Company to oversee a new tender process.