A few days ago the United States Diplomatic Mission issued a Security Message for U.S. Citizens about the Establishment of a Restricted Zone in Hamburg after some police crackdown short before Christmas. Warnings included
Even demonstrations intended to be peaceful can turn confrontational and escalate into violence. You should avoid areas of demonstrations or public gatherings, especially in the restricted areas, and exercise caution if in the vicinity of any large gatherings, protests, or demonstrations.
Well, this is what you could had encountered if you disregarded the warning on Friday evening when a public gathering escalated into a heavy pillow fight on Spielbudenplatz at the famous Reeperbahn no-go area:
Watching carefully you may notice spurious waving and fierce shaking of toilet brushes, the dangerous weapon and brutal symbol of the Hamburg riots.