(AP) — An educator using a secretly installed camera videotaped teenage boys in the shower at a Catholic high school for nearly three years, authorities said.

Patrick J. Lott, who was arrested last week, was arraigned Wednesday on charges he videotaped students in a communal shower area at Immaculata High School in Somerville starting in January 2008. He did not enter a plea.

The prosecutor’s office said that there were at least 22 victims and that nine boys identified in the videos are currently under the age of 16. To protect the boys’ identities, they were referred to only by their initials in court filings.

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