Norwegian police will track funds used by anti-immigration zealot Anders Behring Breivik as part of a year-long probe into his killing spree that left 77 people dead and the nation stunned.A specially created police unit will conduct the investigation, the biggest in Norway's history, into all aspects of the July 22 bombing in Oslo and the shooting spree on nearby Utoeya island. Breivik, 32, has confessed to the attacks.Some of the 100 investigators now on the case are checking whether Breivik had financial help, a senior officer told Reuters, and are seeking clues in Bermuda, Antigua-and-Barbuda."In the interviews he (Breivik) has said he worked for a long time and saved a lot of money to finance his activities later," police prosecutor Paal-Fredrik Hjort Kraby said in an interview."It was several million Norwegian crowns - I won't comment on the exact number - and he said it was from his own work, not from anyone else."In a manifesto Breivik boasted that he earned four million crowns ($743,200) for his plot by 2005 and channeled some through the Caribbean and eastern Europe before losing about half in "stock speculation" by 2008.Oslo police said they were collaborating with authorities in United States, Britain and the Nordic countries.The deputy police chief of Oslo, Hans Halvorsen, said a senior officer would lead the probe, with teams dedicated to technical evidence, victims, witnesses, international cooperation and other aspects of the case."It will probably last about one year," he added.Kraby would not confirm media reports that Breivik has demanded to be evaluated by a Japanese psychiatrist."I can confirm he does not want Norwegian psychiatrists," he said, adding that two court-appointed mental health experts from Norway would begin evaluating Breivik next week.Kraby also confirmed the broad outline of a report in Norwegian newspaper VG that said Breivik called police near the end of his massacre of Labour Party youth -- whom he saw as representing the forces of multiculturalism -- to say the following:"Breivik. Commander. Organised in the anticommunist resistance movement against Islamisation. The operation is completed and will surrender to Delta."Delta is the name of the heavily armed Oslo police unit that moved in on Breivik an hour after the island slaughter began."There was a phone call like that," Kraby told Reuters, adding police had not fully ascertained it was Breivik's voice.Earlier on Wednesday Oslo city workers began removing the sea of flowers, teddy bears, lanterns, flags and cards left in front of the city's cathedral by thousands of visitors in memory of the victims of Breivik's killing spree.Barbara Berntsen from the National Archives of Norway said children's drawings as well as cards and poems in several languages would be kept in the country's archives."There is so much we can study in this material. It is a time capsule of what it was like in the summer of 2011," she told Reuters. "It tells us something about us, how we felt and how we expressed our grief."