Norwegian police said Sunday they were carrying out a raid in Oslo in connection with Friday's twin attacks that killed at least 92 people.
"I can only confirm that we're having a police action towards an address in the east part of Oslo," police spokesman Anders Fridenberg told AFP. "It's linked to the terror investigation."
The raid is being carried out in the Sletteloekka district, around eight kilometres (five miles) northeast of Oslo's centre, he said, declining to provide further details.
Norwegian media showed images of what they said was the operation taking place near an area of wasteland.