 Complete the following phrase:  English football had gone through a number of serious incidents related to football hooliganism throughout 1985. In March, a major riot had occurred during an FA Cup tie between Luton Town and Millwall; on the final day of the English domestic season, the Second Division game between Birmingham City and Leeds United was marred by the death of a 14-year-old Birmingham fan during rioting before the game, while just two days after Scotlands qualifying game in Iceland, the Heysel Stadium disaster had occurred prior to the 