An outdoor party in a Villeray park turned violent when a large group of young people tried to crash the festivities.
Police said that around 8:00 p.m., private security guards refused to let a group of 50 to 100 young people join the party, setting off a confrontation.
Objects were thrown at security and police were called to calm the situation down.
Two security guards suffered minor injuries and a nearby car was damaged.
One man was arrested for assaulting a police officer.
