My guess would be that it's sabotage from the left wing since there's a right wing protest today in Berlin that is done mostly by non-Berliners. (There's also a

My guess would be that it's sabotage from the left wing since there's a right wing protest today in Berlin that is done mostly by non-Berliners. (There's also a lot of busses bringing in protesters.) There was a similar (co-)incident a few years ago.