A lawyer has accused Fresno High staff members of knowing about English teacher Darren Klassen’s illicit sexual affair with an underage student, but doing nothing to stop it, according to a lawsuit filed in Fresno County Superior Court against the Fresno Unified School District.

Fresno attorney Warren Paboojian said Thursday that the sexual abuse/molestation occurred over two years from January 2013 until September, when Klassen was arrested after the girl’s parents told the Fresno Police Department.