Norwegian police interrogated the self-confessed perpetrator of last month's twin attacks for the third time Wednesday, the Verdens Gang (VG) daily reported. But police prosecutor Paal-Fredrik Hjort Kraby would not confirm the report, saying: "We do not want to comment on the (third) interrogation, but we can say that what will be central to that interrogation is that it will be more confrontational." He said police would only confirm the interrogation after it had taken place. VG published a picture on its website of a van it said had transported the confessed killer, rightwing extremist Anders Behring Breivik, sauing that he had arrived at Oslo police headquarters at around 9:00 am (0700 GMT) for interrogation. Since his arrest on July 22, the 32-year-old Breivik has been interrogated twice. He irst set off a car bomb outside government offices in Oslo, killing eight people, before going on a shooting and killing 69 others on the nearby island of Utoeya where the ruling Labour Party's youth wing was hosting a summer camp. His second interrogation last Friday, lasted 10 hours and mainly focused on going through his confession and account of events. Police said he would be questioned again this week, but have so far refused to reveal the exact timing "for security reasons." Vice police commissioner Hans Halvorsen has meanwhile said that around 100 Oslo police officers are working on the investigation with help from a number of colleagues around the country.