There are 750 ZUS in France which are Zone Urbain Sensitive.  These are simply areas with higher unemployment and poverty rates, much like priority neighbourhoods in any big Canadian city.  Many wrongly equate these as being predominately Muslim (most are predominately white) and as being unsafe for police so like many statements there is a grain of truth but slanted.  Same with the rape epidemic in Sweden, Rape has skyrocketed since 2005 due to the change in definition which is much broader than before or elsewhere not Muslim immigration.