In 1985, Liverpool and Juventus, two of the biggest clubs in Europe, were facing each other for the first time in a European Cup final.
Before the match started, Liverpool supporters reacted to taunts from the Italian fans by charging through the lines of Belgian police.
The Juventus fans could do nothing, but retreat as far as a wall, which collapsed under the pressure and onto their own fans below. In the ensuing panic 39 supporters died and over 350 were injured.
UEFA banned English teams from playing in Europe for five years. However, there were positives.
The English FA, with backing from the government, went on a huge campaign to take out the hooligan element, and to some extent succeeded.
In addition, along with the Hillsborough disaster it made people look closely at stadium safety.
Critics noted even before the match, with 58,000 people coming to watch the game, Heysel was a potential death trap.
