Loudoun County Public Schools is investigating a series of complaints filed by teachers at Loudoun Valley High School against Principal Sue Ross and other top administrators at the school, Loudoun schools officials confirmed Tuesday.

The investigation was first reported Tuesday in an article by Leesburg Today. Numerous teachers have complained of “bullying and verbal harassment,” and claimed that they have been pressured by Ross and others in the school administration to manipulate students’ grades, according to the report.

Wayde Byard, spokesperson for Loudoun County public schools, said the school system could not comment further on the investigation because it is a confidential personnel matter.

According to the Leesburg Today story, numerous formal complaints were filed with Loudoun public schools personnel staff and, separately, with the Loudoun Education Association, an advocacy group that represents thousands of public school employees.