You may well be right, fuelair, but I am reminded of the thread somewhere here referencing the Titanic and the Snopes article. I badly want boyntonstu to be wrong, which is exactly the kind of circumstances where us fallible humans are likely to fool ourselves. But, following your advice, I won't put life on hold either.
In light of the fact that boyntonstu typically cites the kind of Islam bashers who operate fast and loose with the truth, that is pretty much a given, isn't it?

Anyway, his (first) source hasn't been picked apart completely yet, and well, with the actual report in hand and Google translate in the other, let's have a party.

I hope Leif, Ryokan or other Norwegians will correct me if I make mistakes in what I read in the report.
Yehuda Bello, an Israeli blogger who is well-acquainted with Norwegian culture, noted the report
So Mr. Rosen has a correspondent who could have read the report and actually told him what was in the report? Or do I read that incorrectly? I'd say "well-acquainted with N. culture" starts with knowing the language.
Anyway, let's look at the figures he claims:
According to the police report there was a total of 186 of known rape cases in 2010. These fall into various categories, the largest one of which is assault-rape, carried out by sheer physical force, of which there were 86 cases.
Let's then first look at Table 3 on p. 27. It has three columns which give the legal categories:
- attempted rape according to penal code par. 49;
- rape according to penal code par. 192, subpar. 1 & 2;
- rape with aggravated circumstances according to par. 192 subpar. 3 - e.g., gang rape, leading to death or transmission of STDs, prior conviction - which raises the maximum sentence from 3 to 21 years.
(the penal code is cited on p. 8).
The rows distinguish the rape to the social circumstances: "festrelatert" is "party rape", "relasjon" is rape within an established relation (not only an SO but also friends and family, see p. 34), "sårbarhet" on vulnerable people without a good social network (it mentions on p. 24 psychiatric patients, prostitutes, drug users), "annet" is "others" and "overfall" is "assault rape", a surprising and random attack, e.g., the stereotypical rape by a stranger who drags off a woman off the street. That accounts for only 24 cases (12.9%), of which 8 attempted rape and 16 rape.
Further down that page is Table 2, which has the same layout, but now tabulates the cases with known perpetrators: 152 of the 186 total cases. Of the "assault rape", none of the 8 attempted rape cases, and only 6 of the 16 rape cases had a known perpetrator. So we're down to 25% of the total of the "assault rape" cases. Table 3 on the next page tallies these into perpetrators with "Norwegian background" - according to footnote 17 on p. 11 someone with at least one parent born in Norway - and "non-Norwegian background". All 6 known assault rape cases are by perpetrators with a non-Norwegian background. For all we know up to now, that includes Danes and Swedes.

The preceding paragraph, top of p. 28, says that additionally, a number of unknown perpetrators had been described by the victim as looking western/nordic (could also be Danes/Swedes

).
Thus far, we can conclude that Mr. Rosen's numbers of "86 assault rape cases" with 83 with a known perpetrator are way off. He seems to have pulled those numbers completely out of his arse; The number 83 only appears in table 3 as the grand total of simple rape cases by known non-Norwegian perpetrators. The number 86 appears twice: in Table 31 as a total of cases in which the perp was intoxicated, and in Table 5.
That brings us to another error in Mr. Rosen's diatribe: he wrote:
These fall into various categories, the largest one of which is assault-rape, carried out by sheer physical force, of which there were 86 cases.
However, the category "assault rape" describes the social circumstances, not the method by which the rapist overpowers his victim. The chapter starting at p. 30 now discusses this aspect. Table 5 gives five categories: "drugging", "physical coercion", "beating", "weapon" and "other/unknown". As you can see, the total number of "physical coercion" cases is indeed 86. Table 7 on p. 31 now tabulates the method against the social circumstances. As you can see, "drugging" was mainly employed in "party rape" circumstances - unsurprisingly - and never in "assault rape" cases, also unsurprisingly. The other three specified methods appear in roughly the same proportions in all social circumstances.
So we can conclude that his equating "assault rape" with "physical force" is way off the mark too.
To expand on the paragraph from the conclusions that Leif already cited, tables 29 and 30 on p. 55 tabulate the ethnic background against the social circumstances of the 152 rape cases. "Middle East" here comprises Turkey, Iraq and Iran, but not Egypt or North Africa. Of the 6 assault rape cases, 4 were committed by 3 different Middle-Easterners, 1 by an African and 1 by an Asian. Of course, these numbers are statistically meaningless. Moreover, as mentioned, of those 5 perps, 2 were underage and 2 were psych cases.
The paragraph between those two tables further mentions that of the 18 unidentified assault rape cases, in 8 cases the perp was described as black/dark skinned, in 5 cases as white and in 4 cases as Asian.
Lastly, the report stresses a couple of times that Oslo is a cosmopolitan city and that ethnic background may thus be meaningless. However, while it does tabulate the rapist population for its ethnic background, it does not compare them to the population-at-large.