(CNN) - As Norway struggles to come to terms with its greatest loss of life in decades, all eyes are on the man charged in the explosion in central Oslo and the deadly shooting rampage at a youth camp.
While police have not officially named him, Norwegian television and newspaper reports have identified the suspect as 32-year-old Anders Behring Breivik, of Norwegian origin.
A picture is emerging, gleaned from official sources and social media, of a right-wing Christian fundamentalist who may have had an issue with Norway's multi-cultural society.
Norwegian and international news outlets have run photographs of a blond man with blue-green eyes and chiseled features, dressed in a preppy style.
A victim who was shot during the attack at the youth camp on Utoya island told CNN Saturday that he had seen pictures of Breivik taken from what is believed to be his Facebook page and shown on NRK and TV2. The victim said he recognized the man from the news reports as the gunman.
A post in Breivik's name on an online forum, Document.no, from December 2009, talks about non-Muslim teenagers being "in an especially precarious situation with regards to being harassed by Islamic youth."
"I know of many hundred occasions where non-Muslims have been robbed, beaten up and harassed by Islamic gangs," the post reads. "I had a best friend between the ages of 12-17 who was a Pakistani, so I was one of the many protected, cool 'potatoes' that had protection. But this also made me see the hypocrisy up close and personal and made me nauseous."
A Twitter account attributed to Breivik by Norwegian newspaper Aftenposten has only one message, dated July 17. "One person with a belief is equal to the force of 100,000 who has only interests," it says, adapting a quote from 19th-century British philosopher John Stuart Mill.
Police have not ruled out the possibility that other people may have helped the suspect, but say at present they are not pursuing any other arrests.
"The official questioning is starting now," Roger Andresen, a police official, told reporters during a news conference Saturday.
The suspect was cooperating with police, making it clear he wanted to explain himself, Andresen said.
Two addresses connected to the suspect are being searched, police said. One of them is believed to be an apartment in Oslo and the other a farm in Hedmark.
NRK reports that Breivik is registered as having run a company which produced "vegetables, melons, roots and tubers" - an industry which allows access to large amounts of fertilizer, the broadcaster notes, which can be used for explosives.
NRK also reports that Breivik does not have a military background and was exempt from Norway's mandatory military service. He has not had any special military training, it adds on its website.
More details on the man are sure to emerge in the coming hours and days. But what many Norwegians find hard to comprehend is that the chief suspect in the massacre appears to be one of their own.
Prime Minister Jens Stoltenberg stressed that whoever was behind the attacks must be dealt with properly.
"It is very important that those who are responsible - one or several persons - are sentenced according to Norwegian law, in the Norwegian system of justice," he said.
"Norway is a small country but it is a proud country. We are all very close, especially in times like this."
CNN's Laura Smith-Spark and Cynthia Wamwayi contributed to this report.