but, but, but how did the shooter get a gun? they are illegal in Germany.
Not only are firearms legal in Germany, what is legal to possess for licensed hunters in Germany (the last time I checked) is bizarre in a couple of ways.
First, because of a criminal act with a pump action shotgun, pump action shotguns are only available by permit to licensed hunters, while these types of shotguns are currently available OTC at any U.S. FFL dealer.
What would be considered short barreled rifles (HK MP5's in semi-auto configuration, AR Platform M4's or shorter variants) under the U.S. National Firearms Act and subject to very strict ownership requirements here are available to German licensed hunters w/o much fanfare, even though the hunting laws in Germany limit semi-auto's in the field to a 2 round magazine capacity.
As an aside, at one point I became aware that the German manufacturer HK was selling completed receivers for their discontinued G 3, G 33 and Mp5 platforms in the original full auto configuration in Germany,
w/o restrictions for export sales. This is the functional equivalent of Colt or FN running off M16 receivers and selling them w/o paperwork to export customers. As I determined at the time, these sales were legal under then German law - things might be different now, but back then this was a legit sale.
In HK's defense their platform still required the front trunnion to be properly installed in the receiver in order for it to go "live," but as properly forming the sheet metal receiver is the most difficult part of the manufacturing process these receivers were more live than not.
My investigation into the situation brought me into contact with a few cool folks that I wouldn't otherwise have met, so that was a win as far as I'm concerned, but the sale of those receivers still ranks as one of the strangest example of legal firearms sales I've encountered.