Overview
- The derby, which took place Monday, erupted after Köln's 67th-minute goal when dozens of fans fought around the Gästeblock and the referee briefly stopped the match.
- Police said six people were hurt, naming a child, three officers, an usher and a spectator among the injured.
- WDR and other video footage show mainly Borussia Mönchengladbach supporters breaking the Plexiglas separation and using pyrotechnics while some Köln fans also fired a rocket from the upper tier.
- Under the July 'stadionallianzen' plan by NRW's interior minister, officers were not stationed inside the stadium so police had to enter from outside and took more than five minutes to secure the upper tier.
- Both clubs condemned the violence and authorities have opened reviews and investigations that could force a prompt reassessment of the club-led security model across German professional football.