Chaos escalated outside the MetLife Stadium in East Rutherford when music fans hoping to purchase a ticket from the box office discovered the gig, starring Chris Brown and Kendrick Lamar, had sold out earlier that evening.

Several disappointed fans attempted to enter the show by climbing fences, and security guards and police subsequently closed the gates to all, including ticket holders, which intensified the conflict.

According to reports, bottles were thrown at police and a team in riot gear was called to calm the violence. Several arrests were made.

A representative for New Jersey State Police says, "This evening, security personnel at one of the entrance gates to MetLife Stadium were confronted by crowds attempting to illegally enter the sold out Summer Jam concert by climbing over fences and forcing their way through security personnel.

"The gates have been shut and troopers on site have called for assistance from several nearby stations to help maintain order. Troopers and stadium security officials are insisting that all people outside of the gates depart the MetLife grounds to avoid congestion when the concert lets out. There is no number of arrests available at this time."

The concert went ahead without further incident.