BERLIN :The German Football Association (DFB) on Wednesday launched an investigation into an alleged injury to German Cup finalists and third-tier club Arminia Bielefeld goalkeeper Jonas Kersken during last week's 2-0 league win at Viktoria Cologne. Kersken went down without any involvement in the 69th minute on Sunday and received treatment, with Arminia coach Mitch Kniat taking the opportunity to talk to his players. Viktoria Cologne coach Olaf Janssen, who was sent off for protesting Kersken'