may 2, 1999 - Rangers clinch the league at Celtic Park in a 0-3 win, with Celtic defender Stephane Mahe controvertially sent off for a 2nd yellow card after 32 minutes, with Rangers a goal up. An invasion by a Celtic fan was followed by missiles being thrown at and striking ref Dallas. Almost immediately a contentious penalty is awarded to Rangers and in the chaos a fan falls from the top tier of the stadium. Two further red cards followed, one for each team, while more missiles were launched at the Rangers team

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https://www.scotsman.com/sport/football/scottish-cup/five-of-the-most-bad-tempered-old-firm-matches-1-4101749

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