Original sentence: Several groups of Liverpool hooligans broke through the boundary between section X and Z, overpowered the police, and charged at the Juventus fans.The fans began to flee toward the perimeter wall of section Z.The wall could not withstand the force of the fleeing Juventus supporters and a lower portion collapsed
Edited sentence: Fans from both side charged at each other up and down the terrace, with little or no interference from the Police, who did not seem to have any idea how to break up the two sets of charging fans.Finally there was a large charge from the Liverpool fans.The Liverpool section was now becoming overcrowded due to the lax ticket collecting at the turnstiles, allowing fans to enter without tearing their ticket stub, thus allowing them to be handed over the back wall, and the fans entering from the neutral zone.The fans retreating Italian fans and neutral fans were hemmed into the opposite corner, and the retaining wall collapsed, causing trampling and people who were at the bottom were suffocated by those coming down the terrace.The throwing of missiles was from both sides of the fence, Liverpool fans who had obtained tickets for the neutral section were in the top right hand corner at the back of the stand, and started to climb over into the Liverpool section, the chain mail fence eventually collapsed