According to the Düsseldorf Ministry of the Interior, the police "found extensive evidence" during the raids after the brutal attack on supporters of Bundesliga soccer club FC Schalke 04. These include firecrackers, firecrackers, "protective weapons and balaclavas typical of the scene" and knives, but also testosterone ampoules and sick leave for the days after the attack.

According to a report to the interior committee of the North Rhine-Westphalian state parliament, the police also seized "various fan paraphernalia from rival football clubs". The investigation is directed against 24 people.

The investigators had searched 25 objects almost two weeks ago, including the Ultras Gelsenkirchen clubhouse. It was about an attack on February 19, in which more than 100 Dortmund and Essen football fans in Gelsenkirchen are said to have attacked Schalke fans at dawn who were about to leave in coaches for the away game against 1. FC Union Berlin. Four people were seriously injured.