A 52-year-old man has been arrested by detectives investigating computer hacking linked to business espionage, Scotland Yard said today.
The man was held at around 7am at his home in Oxfordshire on suspicion of offences under the Computer Misuse Act.
He is currently being questioned and his home is being searched, police said.
The arrest was carried out under Operation Tuleta, an investigation into alleged computer hacking and other privacy breaches.
It falls under part of the inquiry that is looking at suspected business espionage.
Today's arrest brings the number of people held under Operation Tuleta to 20.
Tuleta is being run alongside two other investigations - Operation Elveden, which is looking at alleged corrupt payments to public officials, and Operation Weeting, the phone-hacking inquiry.
Yesterday, a 42-year-old prison officer became the 58th person to be arrested under Operation Elveden.
He was held at his home in Sittingbourne, Kent, on suspicion of conspiracy to cause misconduct in a public office.
The man was later released on bail until March.
So far, of those arrested under Elveden, eight people have or will face court proceedings and two - a retired police officer and a former journalist - have been told they will face no further action.
A total of 26 people have been arrested under Operation Weeting and eight people have been charged.