Miami police are investigating, after an officer knocked out a woman during a University of Miami football game.
Video of the incident was shared on social media, and shows four officers picking up the woman at Hard Rock Stadium and start to carry her out.
The woman, identified as 30-year-old Bridget Freitas, violently resists.
She flails about and slaps the face of an officer, who responds by punching her in the face.
Freitas slumps back motionless, apparently knocked out cold.
A witness told ABC 10 that Freitas had been "making a scandal" and had attempted to hit another woman, before the police arrived.
"She looked like she had no control of herself and she was refusing to leave the stadium," he said.
"This is why it took four police officers to get her out."
The Miami-Dade police department says it is looking into the officers' actions and Freitas has been arrested.
"Promoting a safe and secure environment during any special event is our primary concern," it said on Twitter.
"After responding to a disturbance, the person in the video was being removed from the event by our officers for being disorderly. She was subsequently arrested for Battery on a Law Enforcement Officer and Disorderly Conduct/Breach of the peace.
"Supervisory personnel are aware of the video, and are reviewing the incident to ensure compliance with our policies and procedures."