A Polish football fan has been stabbed and nine police officer injured during an altercation between two groups near Cologne Cathedral, police said late Thursday. The stabbing victim is in critical condition, they said. A suspected accomplice has been detained, police and prosecutors said. The 17-year-old had blood on his clothes. The search is on for the perpetrator. The man who was stabbed was a 32-year-old football fan who belonged to a group of Polish fans on their way to the stadium for Lukas Podolski’s farewell game for FC Cologne. According to initial findings, the Poles had clashed wit…