Many thanks to MissPiggy for translating this article from Politikstube:
Arabic-speaking men handle machine guns in trams — passengers don’t care
Karlsruhe: On Saturday afternoon three men allegedly handled a submachine gun in a tram in Karlsruhe. Since the police currently cannot completely rule out the possibility that this is a real firearm, witnesses are being sought who can give clues about the suspects.
A witness subsequently contacted the police by email, stating that he had previously recognized the shoulder piece of a firearm from a passenger’s shopping bag on tram line 1. In addition, the man had dropped a gun magazine on the floor. He also thinks Arabic was spoken with a fellow traveller.
During further investigations by the criminal investigation department, in particular by looking at video material from the surveillance camera, it was established that the suspects were a group of three men. They had boarded the train at the Europaplatz stop and at 2.21 p.m. were handling a black submachine gun and a corresponding magazine openly in the car. At the stop Kronenplatz the men finally got off the train. The other passengers in the train did not react to the situation.
Since it could not be completely ruled out that the machine gun was a genuine firearm even after the video recordings had been viewed by a weapons expert from the Baden-Württemberg State Criminal Police Office, the Karlsruhe Public Prosecutor’s Office and Criminal Investigation Department are now looking for the three suspects. These can be described as follows:
Two of the men were about 25 to 30 years old, had an Arab appearance with a slim figure and dark black hair. One of them wore black camouflage trousers, a dark green jacket and a black-silver-red backpack. The second was wearing grey cargo pants, a light sweater and a green jacket. He had a big red-yellow plastic bag with him. The third man is estimated to be 30 to 35 years old and 190 cm (6’5”) tall. He was a little more corpulent and had dark black hair. He wore jeans and a black hooded sweater with the white inscription “Uncle Sam” and black sports shoes. One of the men had a blue mountain bike on the track.
Witnesses who can give pertinent information about the actions in the tram or about the men are asked to report to the Kriminaldauerdienst der Kriminalpolizei Karlsruhe at the telephone number 0721 666-5555.
See also Badische Neueste Nachrichten (German).