You're reading: Norway princess’ stepbrother killed in massacre (VIDEO)

OSLO, Norway (AP) — Norway's royal court says Crown Princess Mette-Marit's stepbrother, an off-duty police officer, was among the 86 people killed when a gunman opened fire at a youth camp.

VIDEO: Man accused of Norway terror attacks set to appear in court

Court spokeswoman Marianne Hagen says the victim was Trond Berntsen, the son of Mette-Marit’s stepfather, who died in 2008.

Norwegian police searched for more victims and a possible second gunman on Saturday after a suspected right-wing zealot killed up to 98 people in a shooting spree and bomb attack that have traumatised a once-placid country, reports media.

The 32-year-old Norwegian named Anders Behring Breivik was arrested after Friday’s massacre of young people on a tiny forested holiday island that was hosting the annual summer camp for the youth wing of Norway’s ruling Labour party.

Breivik was also charged for the bombing of Oslo’s government district that killed seven people hours earlier.

If convicted on the terrorism charges, he would face a maximum of 21 years in jail, police said.

Breivik had belonged to an anti-immigration party and wrote blogs attacking multi-culturalism and Islam, but police said he had been unknown to them and that his Internet activity traced so far included no calls for violence.

Witnesses said the gunman, wearing a police uniform, went on a prolonged shooting orgy on Utoeya island northwest of Oslo, picking off his prey unchallenged as youngsters scattered in panic or jumped in the lake to swim for the mainland.

The father of a man charged with attacks says he is in shock and only learnt of his son’s involvement via online newspapers, a Norwegian daily said.

"I was reading the online newspapers and suddenly I saw his name and picture on the net," the father told the daily Verdens Gang of his son, Anders Behring Breivik. It said the man was interviewed "somewhere in France," where he is a pensioner.

"It was a shock to learn about it. I have not recovered yet," he said. The man is a pensioner who lives in France and said he had had no contact with his son since 1995.