That figure about the no-go zones is from the article "Sweden: A Failed State?" over at Gatestone Inst.
Another choice morsel about folks who fought for the Islamic State and then returned to Sweden:
Swedish news outlets have reported that the Swedish towns that receive the returnees do not even know they are returning ISIS fighters. One coordinator of the work against violent Islamist extremism in Stockholm, Christina Kiernan, says that "...at the moment there is no control over those returning from ISIS-controlled areas in the Middle East".Hard to believe that a country would so actively and intentionally destroy itself.