Police officers stand guard outside the stadium of German soccer team Dortmund in Dormund, Germany, on April 11, 2017. German soccer team Dortmund said Tuesday that its Champions League match against Monaco was canceled and one player injured after explosions hit team bus. Three explosions hit Dortmund team's bus in the district of Hoechsten of the western German city of Dortmund. (Xinhua/Ulrich Hufnagel)