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DENVER (AP/KDKA) — Cheerleading coaches and school administrators in a Colorado district were placed on leave and police opened an investigation amid a series of videos showing high school cheerleaders screaming in pain while being pushed into splits during practice.

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The videos show cheerleaders at Denver’s East High School repeatedly being pushed into splits by a coach while their arms are held up by teammates, according to CBS4 in Denver.

In one video, a girl repeatedly asks her coach to “please stop.”

Denver Public Schools superintendent Tom Boasberg called the videos “extremely distressing.”

“We absolutely prohibit any practices that place our students’ physical and mental health in jeopardy,” Boasberg said in a written statement. “We do not and will not allow any situation in which a student is forced to perform an activity or exercise beyond the point at which they express their desire to stop.”

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The East High School principal, an assistant principal, the cheer coach, an assistant cheer coach and a district lawyer were placed on leave during the investigation, Boasberg said.

The Denver Police Department said child-abuse detectives were investigating.

Jim Lord, director of the Cheerleading Coaches and Administration Association, told the station the videos show practices that are outdated and damaging.

Lord said forcing athletes into painful stretching used to happen decades ago. But he said coaches are now required to learn safe stretching practices.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)