As the people of Norway focused on remembering those they had lost, makeshift shrines sprang up across the city and mourners filed into the cathedral yesterday morning.
Many embraced each other next to the growing sea of flowers outside the church.
Prime Minister Jens Stoltenberg spoke on behalf of his traumatised nation: "We are still struggling to get to grips with the dimension of what has happened.
"Many of us know people that have been killed. And many more have second-hand acquaintances with someone that was killed."
The royal couple and prime minister later visited grieving relatives of the young people gunned down, while buildings around the capital lowered flags to half-mast and people streamed to the cathedral to light candles.
The loss of 93 people is a tragedy wherever it happens. But in a country of just 4.9 million, it is a collective catastrophe.
Now that Norwegians are beginning to understand Breivik's sheer ruthlessness, the country's profound belief in forgiveness and redemption will no doubt be sorely tested.
Currently, no-one can be sentenced to more than 21 years in prison for a criminal act.
It raises the prospect that unless Anders Behring Breivik is declared insane, he could be free to walk the streets of Oslo again in less than a quarter of a century.
Flowers and candles were also placed outside the Royal Norwegian Embassy in London, which remained open yesterday to provide support to anyone who needed it, its flag flying at half-mast.
A spokesman said: "People have come to the embassy to express their sympathies. I read some of the notes they left and some were in Norwegian but most were in English."
Yesterday, Pope Benedict XVI called on people to renounce hatred in the face of the "deep sorrow" felt over the Norwegian terror attacks.
The pope urged people to pray for the dead, the wounded and their loved ones as he spoke to pilgrims and tourists from the balcony of his summer palace in Castel Gandolfo near Rome.
Pope Benedict said he was issuing a heartfelt appeal for people to "abandon hatred once and for all" and renounce what he called "the logic of evil".
The pope yesterday sent a condolence message to Norway's king, denouncing the "senseless violence".
His envoy in Norway called the terror attacks "madness" and said the victims would be remembered at Sunday Mass.
"Unfortunately, yet again comes news of death and violence," Pope Benedict said at the start of his greetings to the faithful. "We all feel deep sorrow for the grave terrorist acts.
"I want to again repeat my grief-stricken appeal to all to abandon forever the way of hatred and to run away from the logic of evil," Pope Benedict said in his remarks, speaking in Italian.