Some key matters will need to be scrutinized when a UEFA-commissioned independent review assesses the disorder and chaos surrounding the Champions League final between Liverpool and Real Madrid in Paris.
European soccer's governing body says "evidence will be gathered from all relevant parties" regarding the off-field issues that marred one of the world's biggest club games on Saturday.
That evidence should include the planning and organization of the event, the policing and stewarding, ticketing, the messaging and reaction of UEFA officials and any role that locals played in exploiting the problems.
Liverpool soccer fans, including children and elderly people, said they were met with tear gas as French police used it to try and control fans who were scaling railings trying to get in without a ticket.
Some of the issues the UEFA will review include why there were only a few police officers in and around the stadium and the use of fake tickets.