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Celtic captain Billy McNeill (left) and former Rangers' captain John Grieg (right) on the pitch after leading out the players as the teams mark the 40th anniversary of the Ibrox disaster prior to their Scottish Premier League soccer match at Ibrox Stadium in Glasgow, Scotland, Sunday, Jan. 2 2011. Sixty six supporters were crushed to death on a concrete stairway leading from the Copland Road end of ground after the match between the two clubs on January 2, 1971. (AP Photo/Chris Clark)