A New Jersey vocational school teacher secretly recorded "upskirt" videos of underage female student's "intimate parts," according to a criminal complaint obtained by the South Jersey Times.

Adam Mayr was arrested Friday after nine students, all 14 or 15 years old, outed the 37-year-old teacher to administrators at the Gloucester County Institute of Technology.

Mayr "secretly recorded under the victim's dress while at school...while intimate parts were exposed," Gloucester County prosecutors said in the complaint. The incidents allegedly occurred over the last two years while the teens sat at their desks during school or immediately after school.

The English teacher was charged with multiple counts of invasion of privacy, endangering the welfare of a child and official misconduct, the South Jersey Times reported.

Officials at the school in Deptford Township said Mayr was placed on paid leave pending the investigation.

"GCIT takes an allegation of inappropriate behavior by a teacher seriously," District Spokeswoman Eileen Shute told the newspaper.

"In this situation, the district administration interviewed students and immediately took action, including reporting the matter to the district's school resource officer and the Gloucester County Prosecutor's Office," Shute said.

Mayr, a teacher in the district since 2002, is being held at the Salem County Correctional Facility on $300,000 bail.