Nazi concentration camps in Norway (Norwegian: konsentrasjonsleirer) were concentration camps or prisons in Norway established or taken over by the Quisling regime and Nazi German authorities during the German occupation of Norway that began on 9 April 1940 and used for internment of persons by the Nazi authorities. 709 prison camps or concentration camps, [including some death camps,] were counted by a project that had Randi Bratteli (author and widow of former prime minister and concentration camp prisoner), as an advisor. Another source has claimed that there were around 620 prison camps. There were [at least] 14 different categories of prisoners, in addition to forced laborers, and they came from various countries. The civilian occupying authorities with the Quisling regime and the German Wehrmacht operated a number of camps in Norway, including around 110 prison camps. The Wehrmacht camps were largely POW camps and were scattered throughout the country. Some of these had extremely high mortality rates, owing to inhumane conditions and brutality. Both established and improvised jails and prisons throughout the country were also used for internment by the Nazi authorities. In particular the Sicherheitspolizei and Sicherheitsdienst, headquartered at Victoria Terrasse, were notorious for torture and abuse of prisoners. Also, Arkivet in Kristiansand and Bandeklosteret in Trondheim became synonymous with torture and abuse. Some distinction was made between camps and prisons run by Norwegian Nazis and those run by German Nazi organizations, though it is safe to say that all atrocities took place under the authority of a unified command. The designated concentration camps were not classified as "KZ-Lager" by the Nazis, but rather as Häftingslager ("detainee camps") under the administration of the Nazi "security police," the SS and Gestapo. The Nazi authorities deported over 700 Jews from Norway to Auschwitz, over 500 Nacht und Nebel prisoners to Natzweiler; and thousands more to Sachsenhausen, Ravensbrück and other prisons and camps in Germany. Most of these were kept in Norwegian camps during transit. Although abuse, torture, and murder were commonplace in these camps, none of them were designated or functioned as extermination camps, nor did they reach the scale seen in camps in Germany, occupied Poland, and Austria. It is estimated that between 38,000 and 40,000 individuals passed through this camp system, for a total of 60,000 prisoner years. The camps served varying purposes, including: internment of political prisoners, especially socialists and communists, but also religious dissenters. internment of prisoners