Anders Brehing Breivik, the man accused of the murder of at least 91 Norwegians in a twin bomb and gun massacre, boasted online about his discussions with the far right English Defence League and other anti-Islamic European organisations!

The Norwegian prime minister, Jens Stoltenberg, said Norwegian officials were working with foreign intelligence agencies to see if there was any international involvement in the slaughter. "We have running contact with other countries' intelligence services," he said.

Breivik was arrested on Utøya island where he shot and killed at least 84 people, mostly teenagers, at a youth summer camp for supporters of Norway's Labour Party after bombing Oslo's government district just hours before.Dressed as a policeman, he ordered the teenagers to gather round him before opening fire on them. Survivors described how dozens of people were mown down. Edvard Fornes, 16, described how the gunman told the youths, "Don't be shy," and, "Come and play with me," before executing them. "There were two kids lying, hiding, in a ditch saying, 'please, please don't shoot us,' and he shot them."

Another youth, Ida Knudsen, 16, said she had been in a group of 100 who had initially ran from the killer, but that was reduced to around 60 as the gunman pursued them. Eventually she was one of 12 who climbed into a boat and escaped.

With the entire island a crime scene, officers were still combing the shoreline on Saturday and boats were searching the water for more bodies amid fears the toll could rise further. The police were continuing to investigate whether there had been a second gunman on the island.

The disclosure of Breivik's claimed links with other far right organisations came as details emerged about the rightwing Christian fundamentalist and freemason behind Norway's worst post-war act of violence.

It was revealed that the 32-year-old former member of the country's conservative Progress Party – who had become ever more extreme in his hatred of Muslims, left wingers and the country's political establishment – had ordered six tonnes of fertiliser in May to be used in the bombing. While police continued to interrogate Breivik, who was charged with the mass killings, evidence of his increasingly far right world view emerged from an article he had posted on several Scandinavian websites, including Nordisk – a site frequented by neo-Nazis, far right radicals and Islamophobes since 2009.

The Norwegian daily VG quoted one of Breivik's friends saying that he had become a rightwing extremist in his late 20s and was now a strong opponent of multi-culturalism, expressing strong nationalistic views in online debates.

Breivik had talked admiringly about conversations he had had with unnamed English Defence League members and the organisation Stop the Islamification of Europe over the success of provocative street actions leading to violence.

"I have on some occasions had discussions with SIOE and EDL and recommended them to use certain strategies," he wrote two years ago.

"The tactics of the EDL are now to 'lure' an overreaction from the Jihad Youth/Extreme-Marxists, something they have succeeded in doing several times already." Contacted about the allegation by email by last night the EDL had not answered.

The latest disclosures came as the Norwegian prime minister Jens Stoltenberg flew by helicopter to a hotel in the town of Sundvollen – close to the island of Utøya – where many survivors were taken and where relatives converged to reunite with their loved ones or to identify their dead.

"A whole world is thinking of them," Stoltenberg said, his voice cracking with emotion. He said the twin attacks made Friday the deadliest day in peacetime Norway. "This is beyond comprehension. It's a nightmare. It's a nightmare for those who have been killed, for their mothers and fathers, family and friends," he said.

Buildings around the capital lowered their flags to half-staff. People streamed to Oslo cathedral to light candles and lay flowers; outside, mourners began building a makeshift altar from dug-up cobblestones. On Saturday the Queen wrote to Norway's King Harald to offer her condolences and express her shock and sadness...let's hope that the Queen now publicly rejects the message of the EDL and their vision of "Britishness" because maybe if she speaks then their deluded supporters might listen!