Cologne's world-famous Carnival season kicked off on Monday, with many of the celebrations spilling over into civil disobedience and physical attacks.
One 22-year-old man was assaulted from behind and had a plastic zip tie placed around his neck and tightened. He was freed by a paramedic at a nearby medical tent, who reported that a similar event had occurred earlier in the day.
In another incident, an 18-year-old reveler was struck by leftover building material thrown from a nearby building and suffered minor injuries. A 17-year-old and a 19-year-old were detained.
By late evening, seven people had been arrested, a Carnival record, according to police.
Several drunken users of e-scooters were also punished.
Traditionally, every November 11, up to 70,000 people celebrate the beginning of Carnival season in the western German city on the Rhine.