(FILES) This file photo taken on April 18, 2017 shows police officers investigating the crime scene close to the hotel L'Arrivee in Dortmund, western Germany, where the team bus of German first division Bundesliga football club Borussia Dortmund was rocked by explosions. According to the public prosecution, a German-Russian man has been arrested on April 21, 2017 in southern Germany in connection with the bomb attack on Dortmund's team bus. The bus was hit by an explosives attack when it was en route to the stadium in Dortmund for the Champions League quarter-final, first-leg football match against Monaco on April 11, 2017. / AFP PHOTO / Ina Fassbender Bild: INA FASSBENDER (APA/AFP/INA FASSBENDER)