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“Children can be smiling. Children can be laughing. The adult can be very skilled at setting this up as a game at these ages,” Ms. Anderson said.

Mr. Fleming rejected such assessments of the videos: “I don’t know how they can say it when they haven’t seen (them),” he said.

Mr. Hoffner has been placed on leave at Minnesota State, where he was entering his fifth year as football coach. Authorities said they uncovered the videos after Mr. Hoffner brought his university-issued phone to the school’s information technology department earlier this month because it wasn’t working properly. An employee came across the videos and reported them to his superiors.

“There was certainly something in what they saw that concerned them. It’s good to see they were willing to report it,” Ms. Anderson said.

Associated Press writer Amy Forliti contributed to this report.