I have worked as a psychologist with these kind of people. One of the things I discovered as a prison psychologist was that you find that the most religious Muslims are among the most violent ones. Via 10News.dk, translated from Ekstrabladet:
This weekend the gang member Ahmed Syria from the group Black Army crossed the border to Syria, probability because he again wants to take up arms in Syria. …
CTA (Center for Terror Analysis) estimates that returnees from Syria associated with militant Islamist groups in Denmark, who also have connections with criminal circles, have easier access to financing, weapons and explosives, and may pose a particular threat.