In an (unsurprising) turn of events, Spiegel Online now reports that 6 of them were already known to police due to previous criminal activity, including bodily harm.
They came to Germany between 2014 and 2016.
http://m.spiegel.de/panorama/justiz/a-1127650.html
They came to Germany between 2014 and 2016.
http://m.spiegel.de/panorama/justiz/a-1127650.html