PORTLAND, Ore. (AP) – A report says at least nine former teachers and other staffers at a private school in Portland, Oregon, sexually abused, groped or had sex with students in the last four decades.

The Oregonian/OregonLive reports that those were the findings of a year-long internal investigation commissioned by the board of trustees at Catlin Gabel.

The investigation was launched last October after a former student alleged on Facebook that she’d been abused by a Catlin teacher.

Catlin apologized to parents in a letter it issued Wednesday.

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