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PITTSBURGH (KDKA) — Pittsburgh Police are investigating after violent video surfaced showing Pittsburgh Steelers fans attacking each other during Sunday night’s game against the Los Angeles Chargers.

The video was posted to social media and shows Steelers fans throwing beers, throwing fists and even violently head-butting each other during the loss.

In the video, it appears mostly fans in Steelers jerseys were involved in the fight at Heinz Field.

Fan Kate Brendel first posted the video on her Twitter account.

The video has been viewed nearly 2 million times and shared thousands of times.

Witness Garry Booker told KDKA-TV News he became aware of the bickering in the first half of the game.

“You can tell something was going on during the second half of the game. There were arguments regarding play calling, refereeing and many other things football related,” he said.

Booker said it appeared alcohol was a big factor in the escalating confrontation and he heard the two men arguing about whether Coach Mike Tomlin should be fired for the team’s troubles.

Security quickly came over to handle the situation.

“Heinz Field security did a fantastic job de-escalating, which you can’t see in the video,” Booker said.

Fans took to social media offering their comments on the video, some saying this is the reason they don’t take their children to games anymore.

Pittsburgh Police say they are aware of the video and the incident and are investigating.

In a separate incident at the stadium, at least one person is facing charges. Thirty-year-old Amy Marie Brown, of Oceanside, Calif., is being charged with defiant trespassing and disorderly conduct.

According to a criminal complaint, Brown repeatedly interfered with security officers and police officers who were trying to remove one of the men involved in a fight from the stadium. Brown allegedly tried to excuse the man’s behavior and later began to push and shove a police officer who tried to stop the man from going to the restroom.

Police say they believed Brown was a flight risk since she lives in California and planned to fly out of Pittsburgh on Monday morning. Because of this, Brown was sent to the Allegheny County Jail.