FARIBAULT — A southern Minnesota boarding school faces a third lawsuit alleging that the school knew a former teacher was sexually abusing male students but took no action.

Attorneys for a former student filed the lawsuit Tuesday against Shattuck-St. Mary’s school in Faribault.

The lawsuit alleges the student was sexually abused from 2000-2001 while he was a student at the school.

The suit contends another teacher reported to the school during the 1999-2000 school year that Lynn Seibel was abusing students.

Seibel was sentenced last October to more than four years in prison for sexually abusing six male students more than a decade ago.