Five men have been arrested in connection with alleged corruption in football, police have said.
City of London Police said the men - aged 69, 60, 55, 48 and 30 - were arrested on suspicion of conspiracy to defraud and false accounting.
Portsmouth football club said manager Harry Redknapp and chief executive Peter Storrie were among those held.
The arrests were part of the force's ongoing investigation into corruption within the game, a spokeswoman said.
Two searches are still under way and 10 others have been concluded at locations across the country.
Detectives from the economic crime unit of the City of London Police are investigating allegations of corruption within football and its impact on owners and shareholders.
In July, officers raided Newcastle United, Portsmouth and Rangers football clubs as part of the inquiry.