Judge Kim Heger said mass murderer Anders Behring Breivik had admitted to perpetrating the twin attacks in Oslo and Utoya but had not pleaded guilty.
Norway's mass murderer Anders Behring Breivik was Monday sent to a solitary confinement by a court after he boasted about his crime and warned of "two more cells" prepared to carry out attacks, a media report said.
Judge Kim Heger said Breivik had admitted to perpetrating the twin attacks in Oslo and Utoya but had not pleaded guilty.
Breivik said he was defending western Europe from "Muslim takeover" and making the ruling Labour Party pay for "failing" the country, the Telegraph reported.
Heger said Breivik has been charged with terrorism after Friday's attacks that left 93 people dead, and ordered that he be held in custody for eight weeks because there was a risk he might "tamper with evidence" if released.
The 32-year-old will be held in solitary confinement until at least August 22 and will be banned from seeing visitors, receiving letters and reading newspapers or watching television for the entire remand period up until September 26.
During the hearing, which was closed to both the public and the media, Breivik warned there were "two more cells in our organisation" that would continue his work, the daily said.
In a televised statement, Judge Heger said: "He has not pleaded guilty. The accused believes that he needed to carry out this act in order to save Norway and western Europe from cultural Marxism and Muslim take-over."
"The operation was not to kill as many innocent people as but to give a signal that could not be misunderstood. As long as the Labour Party keeps driving its ideological line and mass importing of Muslims, it must assume responsibility for this treason."
He said the killings at the Labour Party youth camp were designed to stop recruitment to the centre-left party.
"Any person with a conscience can't allow their country to be colonised by Muslims," the Telegraph quoted him as saying.
Breivik arrived at the court under heavy guard as hundreds of people and the world's media waited outside.
He was pictured in the back of a police vehicle wearing a red jumper and looking placid. He was driven into the court's basement car park in the back of a heavily armoured vehicle, which onlookers banged on as it drove past.
Following a request from police, Judge Kim Heger ruled that the hearing would be closed and the media and public would be barred from attending.
Breivik's lawyer Geir Lippestad revealed that the gunman had requested the hearing be held in the open and that he be allowed to wear a uniform.
"He has two wishes: the first is that there is a public hearing and the second is that he is allowed to wear a uniform," the newspaper quoted Lippestad as saying.
Earlier, King Harald and Queen Sonja led Norway and other Scandinavian countries in a minute of silence for the 93 victims of Friday's gruesome terrorist attack.
The royals joined Prime Minister Jens Stoltenberg at the University of Oslo at noon to honour those killed in the country's worst violence since the Second World War, the daily said.
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