It only takes a few troublemakers to spoil everything–this is just plain insanity.

Hot 97’s annual Summer Jam was held last night (June 7) at MetLife Stadium in East Rutherford, New Jersey and, instead of just being a night featuring the music world’s biggest hip-hop artists, it turned into chaos.

According to state police, as well as photos and videos posted to social media by eyewitnesses, several people tried to enter the venue without tickets to the sold-out show. Security closed the entrance and called state police to control the situation.

Police sent an armored vehicle and unleashed tear gas to disperse the crowd.

A total of 61 people were arrested, and 10 state troopers suffered injuries.

Several ticketholders were excluded from the event when the gates were closed for safety. Hot 97 has since announced that all tickets that were not scanned will be reimbursed.

“Due to strong demand for tickets for Summer Jam 2015, the show sold out early this evening. When fans realized tickets were not available at the box office, a small number of people created an unsafe environment, and for the safety of all guests, the New Jersey State Police were on scene to disperse the crowd. The gates were closed at that time. No further entry was permitted into the event. For ticket holders whose tickets were not scanned, refunds will be offered at the point of purchase,” the radio station’s official statement read.

Fans inside the venue emerged after the show to find broken glass and debris, a result of people throwing bottles at police officers.

Performers that night included Chris Brown, Trey Songz, and Big Sean, among others.

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