Breivik e-mailed the 1,500-page document to online contacts on July 22, less than 90 minutes before he detonated a bomb in downtown Oslo, then went on a shooting spree on nearby island. Seventy-seven people died.
The manifesto had links to material Breivik used to support his claims about what he perceived as a threat from multiculturalism.
But an analysis by Rolf Froysa, chief technology officer of a Norwegian broadband firm, revealed several dead links and large portions of the manifesto plagiarized Ted Kaczynski, known in the United States as the Unabomber, The Daily Telegraph reported Tuesday.
During his investigation of the manifesto's broken links and numbers they contained, Froysa found a troubling pattern, the British newspaper reported.
"I suddenly saw that some of the work I had been doing suggested they could be GPS coordinates," Froysa said.
The coordinates seemed to correspond with major sites across Europe, he said. Because Breivik claimed he was part of a larger network of right-wing extremists, Froysa and others turned their findings over to the police.
"It could just be a hoax or part of his [Breivik's] PR strategy," Froysa said, "but we need to investigate this document."