The Champions League final between Liverpool and Real Madrid was marred by crowd control problems at the Stade de France in Paris.
According to French Sports Minister Amelie Oudea-Castera, the initial issues were caused by a large gathering of Liverpool fans without tickets or with fake tickets.
"When there are that many people by the entrance to the stadium, there will be people trying to force their way in through the doors," she explained in an interview with French radio RTL.
Television footage showed images of young men jumping the gates of the stadium and running away, while others outside, including children, were tear-gassed by riot police.
The chaotic scenes at the French national stadium were branded a national embarrassment, with France due to host the 2023 Rugby World Cup and the 2024 Olympic Games.
Liverpool Chief Executive Billy Hogan described the treatment of Liverpool fans as "unacceptable" and called for a "transparent investigation" by governing body UEFA.
Britain's minister for sport, Nadine Dorries, also urged UEFA to launch an investigation.
