Marcelo Gallardo coach of River Plate, center, leaves the field protected by riot police after the match against Boca Juniors was suspended during a Copa Libertadores soccer match in Buenos Aires, Argentina, Friday, May 15, 2015. Conmebol authorities and referee Dario Herrera canceled the game after pepper spray was thrown from the stands towards River Plate players, before the start of the second half of the game.
Victor Caivano Associated Press