French gendarmes are searching the house of the father of the man who confessed to attacks that killed 93 people in Norway.
About a dozen gendarmes are surrounding the house in Cournanel in southern France on Monday, entering and leaving at irregular intervals.
The house is cordoned off, and reporters do not have access.
The regional gendarme service confirmed the house was that of Anders Behring Breivik's father but would not comment on the search operation.
News reports have said Breivik's father, Jens Breivik, has not been in touch with his son in many years.
Breivik, 32, has confessed he was behind Friday's bombing in downtown Oslo and shooting massacre at a youth camp outside the capital, but denies criminal responsibility.