At least 100,000 people rallied in Oslo and tens of thousands more marched in cities across Norway yesterday in a nationwide expression of grief and unity over the massacre of 76 people by Anders Behring Breivik.

Breivik told a judge in a closed hearing yesterday his bombing and shooting rampage aimed to save Europe from a Muslim takeover, and said that “two more cells” existed in his group.

Police said they could not rule out the possibility that others were involved in Friday’s attacks and they revised down the death toll to 76 from 93: eight dead in a bomb blast in Oslo and 68 at a Labour Party youth camp on Utoeya island.

Stoltenberg addressed the evening crowd, many of them holding up red and white roses for remembrance, his voice trembling with emotion: “By taking part you are saying a resounding ‘yes’ to democracy.” He called the Rose March a “march for democracy, a march for tolerance, a march for unity.”

“Evil can kill a person but never conquer a people.”

In a country of 4.8 million, where a single murder makes front-page news, the solidarity rally was probably the biggest since World War II.

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A Norwegian court yesterday decided to detain self-confessed gunman Anders Behring Breivik for eight weeks during a police investigation of the attacks. The court agreed to keep Breivik in solitary confinement with a ban on letters, access to media and visitors. He would be held in the strictest isolation for at least four weeks.

Norwegian police said Breivik had said during interrogation that he was prepared to spend the rest of his life in prison.

Discovery Channel has commissioned a one-hour documentary about Friday’s tragedy in Norway that will air in select international markets in August, the network announced yesterday.

Judge Kim Heger said Breivik had accused the ruling Labour Party of betraying Norway with “mass imports of Muslims.” He said his attacks were aimed at deterring future recruitment to the party.