A former senior City of London police officer from south west London has been arrested on suspicion of passing information to a journalist.
The Independent Police Complaints Commission said the 52-year-old was held on suspicion of misconduct in public office at his home.
He is being questioned and there is no suggestion that he received money for the information, the IPCC said.
The man was held over allegations that he passed on "unauthorised information".
The arrest came about as part of an independent IPCC investigation that is running alongside Operation Elveden, the Metropolitan Police probe into alleged corrupt payments and information leaks.
Another City of London officer was arrested as part of the IPCC inquiry on June 14 last year and released on bail.
Again, there is no indication that case that the officer received payment.
Two weeks ago a 51-year-old Met Police chief superintendent aged 51 was arrested at his home in Wiltshire in a 6am raid.
Police said he was questioned on suspicion of misconduct in a public office following information supplied by News Corp’s Management and Standards Committee.