Norwegian police are investigating a pedophile network suspected to involve at least 51 people, and which includes the abuse of infants and at least one case of a suspect acknowledging abusing his own children.

Police have arrested 20 men so far in western Norway, with three convictions, in Norway's largest abuse case to date, Deputy Police Chief Gunnar Floystad said. The 31 other suspects are from other regions in Norway.

Floystad told reporters Sunday that many of the suspects are highly educated, and include lawyers and politicians. He said he could not reveal more details pending the conclusion of the investigation, known as "Dark Room," which began in 2015.

Prosecutors said the perpetrators met on the dark web, using encryption and anonymity to hide their tracks.