*Multiple reports say that police clashed with concertgoers outside MetLife Stadium in East Rutherford, New Jersey Sunday night at the Hot 97 (radio) Summer Jam event where Chris Brown, Big Sean and Kendrick Lamar were set to perform.

Emmis New York, the parent company of Hot 97, said police were forced to disperse people at the gates after a few “people created an unsafe environment” upon learning that the tickets for the music festival were sold out.

“For the safety of all guests, the New Jersey State Police were on scene to disperse the crowd,” a spokeswoman for the company said in a statement. “The gates were closed at that time. No further entry was permitted into the event.”

Here’s what the Ashbury Park Press is reporting about the incident:

Witnesses say the disturbance began around 7 p.m. due to an altercation between concertgoers. That when officials shut the gates to the show, the Hot 97 Summer Jam at the MetLife Stadium, East Rutherford, causing a logjam of people at the MetLife gate, which in turn led to metal barriers being toppled and thrown.

After concertgoers began throwing bottles in response, police then took up a defensive V-shaped position in front of the stadium gates as a barrage of bottles pelted the officers.

An armored state police vehicle came into the middle of the crowd and activated a piercing alarm to try and disrupt the crowd of about 1,000 people.

Several rounds of tear gas were released into the crowd and one concertgoer was Maced in the parking lot.

Uniformed officers wearing helmets and gas masks and holding shields would briefly come out from behind the gates to make arrests, before retreating.

The concert which featured performers Kendrick Lamar, Chris Brown and others went on despite the disturbance in the parking lot.

You can MORE info at the Ashbury Park Press and/or IBTimes.

Check out the the following Instagrams from people on the scne:

Update. They are now throwing tear gas at paying customers #summerjam #summerjam2015 #metlife #metlifedontcareaboutblackpeople

A video posted by #artistformerlyknownasjbdraws (@joetorious_) on