In the seven-minute clip posted to YouTube, the girl can be seen confronting the officer who was one of a dozen cops police said were sent to deal with a group of teenagers who had gone to a community pool where they were not allowed and refused to leave.

The now-suspended officer uses profanity, grabs the girl by the back of her head and forces her to the ground, face-down.

The incident Friday evening began with a report that there were “multiple juveniles” at the Craig Ranch North Community Pool who “do not live in the area or have permission to be there, refusing to leave,” McKinney police spokeswoman Sabrina Boston said.

After a group of officers responded to the call and “encountered a large crowd that refused to comply with police commands,” she said, additional units were sent.

A formal investigation into the incident has been started and the officer involved — who was not identified — has been placed on administrative leave, pending the outcome of the investigation, Police Chief Greg Conley said at a news conference today.

“Several concerns about the conduct of one of the officers at the scene have been raised,” Conley said. “The McKinney Police Department is committed to treating all persons fairly under the law. We are committed to preserving the peace and safety of our community for all our citizens.”

An adult male was arrested for interference with the duties of a police officer and evading arrest, he said.

Everyone else who had been detained by officers, including a 14-year-old female, was released to a parent, legal guardian or responsible adult, Conley added