at the opening of the season. More than 1,000 police officers were deployed to the derby and the match was played without crowd trouble. Banners in solidarity with the supporters of BFC Dynamo were displayed in 17 football stadiums across Germany during the following matchdays. The return match between BFC Dynamo and Union Berlin in the 2005–06 NOFV-Oberliga Nord was played at the Stadion im Sportforum on 13 May 2006. The standing was 1–1 when supporters of BFC Dynamo invaded the pitch in an attempt to storm the block of Union Berlin around the 75th minute. Supporters of Union Berlin fled in panic. The match was abandoned and Union Berlin was awarded a 2–0 win. The players of BFC Dynamo wore the motto "No power of violence" on their shirts in the following match against BFC Preussen away on 17 May 2006. The Stadion im Sportforum was temporarily closed for matches in the NOFV-Oberliga Nord after the riots. The riots during the match against 1. FC Union Berlin threw the club into a financial crisis. Treasurer Sven Radicke concluded: "Four years of our work were ruined in five minutes". BFC Dynamo has often attracted hooligans from outside, and hooligans who are otherwise not involved in the supporter scene, to high-profile matches. The club has repeatedly complained about so-called "riot tourists". Riots broke out after the match against Berliner AK 07 in the final of the 2009–10 Berlin Cup at the Friedrich-Ludwig-Jahn-Sportpark on 2 June 2010. Around 100–150 supporters of BFC Dynamo attempted to invade the pitch after the final whistle. Match stewards and players of BFC Dynamo threw themselves in to restrain supporters and prevent further riots. Goalkeeper Nico Thomaschewski later received an award from the Berlin Football Association (BFV) for his actions. Polish fans of Pogoń Szczecin were allegedly linked to the riots. Those who had invaded the pitch were whistled by other supporters of BFC Dynamo when they returned to the stands. Major riots then occurred after the match against 1. FC Kaiserslautern in the first round of the 2011-12 DFB-Pokal at the Friedrich-Ludwig-Jahn-Sportpark on 3 July 2011. Around 200–300 supporters of BFC Dynamo invaded the buffer zone and stormed the guest block after the match. 18 police officers and many supporters from Kaiserslautern were injured in the attack. The Chairman of the Economic Council Peter Meyer openly expressed his embarrassment and disappointment over the behavior of some