The video, which has been posted on YouTube, shows the policeman aggressively throwing a 14-year-old girl to the ground and kneeling on top of her as residents yell at him to let her go.
As some approach, the officer pulls out his gun causing them to run away. Throughout the video the girl can be heard screaming for her mother.
WARNING: CONTAINS STRONG LANGUAGE
McKinney Police Department said the chaos began after a fight broke out between two women at the Craig Ranch North Community Pool.
A dozen police officers eventually responded where private security and home owners "were pointing out juveniles who were creating the disturbance, fighting and refusing to leave."
Police Chief Greg Conley said a 14-year-old female was "temporarily detained" by one of the officers before she was released to her parents.
"Several concerns about the conduct of one of the officers at the scene have been raised," he wrote on the Department's Facebook page.
"A formal investigation into the incident has been started and the officer involved has been placed on administrative leave pending the outcome of the investigation."
Brandon Brooks, who posted the video on YouTube, said police had started handcuffing and ordering people onto the ground for no reason.
"This kind of force is uncalled for, especially on children and innocent bystanders," he wrote below the video.
Police have not identified the officer responsible, but he's been named in several reports as Cpl. Eric Casebolt, a 10-year-veteran who also serves as a vice president of McKinney’s police union.
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