The police force of Germany's party capital Berlin is no stranger to controversy.
In January, an officer raised eyebrows after it was revealed that he had acted in a porn film before joining the force.
According to a report in Spiegel on Tuesday, three police units have been sent back to Berlin.
"It is a terrible deed which one cannot understand. Many people are injured, are fighting for their lives and their health.
An audio tour covers the palace interior, where most of the original furnishings remain just as the Prussian king preferred them, and on a fine day the huge gardens are perfect for an impromptu picnic.
Hardcore palace fans may have enough energy for a gander at the Orangery and the Spielfestung, or "toy fortress" -- a miniature fort, complete with a working cannon, built for Frederick's son.
So, despite its hallowed reputation, few people know what lies past its blocky, concrete exterior.
And accounts by “chosen ones” who are let in are equally vague (‘it was very dark inside. Now, artist Felix Scheinberger’s illustrations of the nightclub and other spots in Berlin's underground fetish club scene offer a fascinating insight into a world that remains mysterious in order to protect its LGBT clientele.