Panathinaikos fans light flares before their soccer match against Olympiakos at the Apostolos Nikolaidis stadium in Athens, Greece November 21, 2015. The top of the table Athens derby clash between hosts Panathinaikos and league leaders Olympiakos Piraeus was called off before kick-off on Saturday following violent scenes with flares being thrown on to the pitch. REUTERS/Intimenews THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. GREECE OUT. NO COMMERCIAL OR EDITORIAL SALES IN GREECE. NO RESALES. NO ARCHIVE