This is the most terrifying news I ever heard of. The Parents of the victims were believing that their sons and daughters were doing great by attending such summer camp on this Island. No one know that only one man could finish their lives in a massive and horrible way.
The number killed in the island shooting spree, which is among the world's most deadly, had been put at 10 on Friday - but soared overnight. Hundreds of young people had been attending the summer camp organised by the governing Labour Party on Utoeya island.
Eyewitnesses described how a tall, blond man dressed as a policeman opened fire indiscriminately, prompting camp attendees to jump into the water to try to escape the hail of bullets.
Some of the teenagers were shot at as they tried to swim to safety.
Armed police were deployed to the island but details of the operation to capture the suspect remain unclear. After his arrest he was charged with committing acts of terrorism.
Police say they discovered many more victims after searching the area around the island. They have warned the death toll may rise further as rescue teams continue to scour the waters.
The gunman is reported to have been armed with two weapons, one of them an automatic rifle.
NRK journalist Ole Torp told the BBC the suspect went to the island dressed in a police uniform, asked people to gather round and then started shooting.
The attacks sparked strong international condemnation, with US President Barack Obama expressing his condolences and offering support.
Anders Behring Breivik, the 32-year-old suspect in Friday's attacks in Norway, held right-wing views, say police.
Police chief Sveinung Sponheim said his internet postings "suggest that he has some political traits directed toward the right, and anti-Muslim views".
"But whether that was a motivation for the actual act remains to be seen," he told Norwegian broadcaster NRK.
Mr Breivik appears to have created entries on social networking sites such as Facebook and Twitter, though the accounts were set up just days ago on 17 July.
On the Facebook page attributed to him, he describes himself as a Christian and a conservative. The Facebook page is no longer available but it also listed interests such as bodybuilding and freemasonry.
A Twitter account attributed to the suspect has also emerged but it only has one post, which is a quote from philosopher John Stuart Mill: "One person with a belief is equal to the force of 100,000 who have only interests."
In a post in Norwegian in an online forum on December 2009, a user named Anders Behring Breivik claims there is not one country where Muslims have peacefully lived with non-Muslims, stating that instead it has had "catastrophic consequences" for non-Muslims.
Mr Breivik was a member of a Swedish neo-Nazi internet forum called Nordisk, according to Expo, a Swedish group monitoring far-right activity.
Police say they are investigating whether there was a second attacker, as witness statements appear to suggest.Fertiliser
The gunman was described by witnesses who saw him on Utoeya island as tall and blond - and dressed in a police uniform. The image of him posted on Facebook depicts a blond, blue-eyed man.
The Norwegian newspaper Verdens Gang quoted a friend as saying that the suspect turned to right-wing extremism in his late 20s.
Mr Breivik had no military background except for ordinary national service and no criminal record, it seems.
Police say he put down his weapon when told to, after a shooting spree which lasted about 90 minutes.
He is talking to them and has admitted firing weapons on the island, but it is not clear if he has confessed to anything else.
On Saturday it was confirmed that Mr Breivik was previously a member of the right-wing Progress Party (FrP), the second largest party in Norway's parliament.
A statement on the FrP website said he became a member in 1999 and paid his last membership fee in 2004. He was deleted from the member registry in 2006.
He was a member of St Hanshaugen FrP, a local party chapter in a borough of Oslo, in 2001-2003.
He was also a member of the FrP youth wing from 1997 to 2006/2007. He deleted his membership in 2007.
Mr Breivik is believed to have grown up in Oslo, and studied at the Oslo School of Management, which offers degrees and postgraduate courses.
A school friend told Norwegian TV he did not recognise him as the boy he knew.
"One of his good work-out buddies was from the Middle East, and it seems as though they were good friends all through junior high school, and hung out a lot together," Michael Tomala said.
"It seems as though he has taken a completely different direction than what we knew of him from junior high school."
He later appears to have moved out of the city and established Breivik Geofarm, a company Norwegian media is describing as a farming sole proprietorship set up to cultivate vegetables, melons, roots and tubers.
A supply company has come forward to say that it delivered six tonnes of fertiliser to this company in May - an ingredient used in bomb-making.