Scores of thousands of Norwegians poured on to the streets of the capital in the early evening, many of them raising up flowers in memory of the eight people killed in the Oslo blast and 68 now known to have died on the island of Utoeya.
Thousands of candles flickered, many people carried flowers, sang hymns and hugged each other.
Prime Minister Jens Stoltenberg also addressed crowds in Oslo saying: "By taking part, you are saying a resounding 'yes' to democracy."
He said this was a "march for democracy, a march for tolerance, a march for unity", adding: "Evil can kill a person but never conquer a people."
The streets of central Oslo had been closed to accommodate the masses.
BBC