More than 200 Borussia Mönchengladbach and Cologne fans have been detained after incidents ahead of their Bundesliga derby match, police said on Saturday. Police said that 131 Gladbach and 74 Cologne “problematic fans” were in custody and would remain there until after Saturday afternoon’s game. The statement said investigations have been launched into offences including breaches of the Explosives Act, aggravated breach of the peace and resisting security forces. Diehard fans from both sides had confronted each other outside Gladbach’s stadium on Friday night, with pyrotechnics lit. A police f…