Riot police separate opposing fan blocks prior to the German first division Bundesliga football match Borussia Dortmund vs FC Schalke 04 in Dortmund, western Germany, on March 25, 2014. AFP PHOTO / SASCHA SCHUERMANN

RESTRICTIONS - DFL RULES TO LIMIT THE ONLINE USAGE DURING MATCH TIME TO 15 PICTURES PER MATCH. FOR FURTHER QUERIES PLEASE CONTACT DFL DIRECTLY AT + 49 69 650050.        (Photo credit should read SASCHA SCHUERMANN/AFP/Getty Images)