A man has been arrested as part of an investigation into alleged breaches of privacy, police said.
The 55-year-old was arrested at his home in East Sussex on Tuesday morning on suspicion of conspiracy to commit offences under Section 3 of the Computer Misuse Act 1990 and Sections 1 and 2 of the Regulation of Investigatory Powers Act 2000, Scotland Yard said.
The arrest brings to 19 the number of people arrested under Operation Tuleta, a Metropolitan Police investigation into privacy breaches including the alleged hacking of computers and stolen mobile phones.
The operation is being run in tandem with two other investigations: Operation Weeting, which is looking at alleged phone hacking, and Operation Elveden, an inquiry into claims of corrupt payments to public officials.
The man is being questioned at a Sussex police station.
Scotland Yard said the arrest was not directly linked to any news organisation or the activities of journalists.