Norwegian Prime Minister Jens Stoltenberg says Norwegians will defend themselves by showing they are not afraid of violence, and that the response to last week's terror attacks will be “more democracy, more openness.”

At a news conference Wednesday, Mr. Stoltenberg said extremist political views are legitimate, but implementing them violently is not.

At least 76 people were killed Friday in an attack on government buildings in Oslo and a rampage on an island youth camp. A right-wing extremist confessed to carrying out the attacks, saying he was trying to save Europe from what he called “Muslim colonization.”

Some government workers are planning to return to work at their offices in the buildings where the bomb blasts blew out most windows.

Earlier, Norwegian police said a suspicious suitcase found on a bus at the central station in the capital poses no danger. Norway is on high alert after the bombing and massacre.