KNOXVILLE, Tenn. (WATE) — Police confiscated a loaded assault rifle from a car parked at a Knoxville private school on Friday after receiving a tip that an 18-year-old may have gone to the school to confront a teacher.

Aidan Eldridge, 18, was arrested Friday around 8:30 p.m. on the campus of Christian Academy of Knoxville after law enforcement received a tip that he ‘wasn’t in his right mind’ and was possibly going to the school to confront a former teacher that he had problems with while armed.

Officers found a 2000 Gold F-150 pickup driven by the suspect in the parking lot unoccupied with a loaded “assault rifle” in the front floorboard according to the report. Eldridge was taken into custody at the football stadium where a game between CAK and George Walton Academy, a private school based in Monroe, Georgia, was taking place.

The report states Eldridge admitted that he drove to the campus. He faces charges of carrying a weapon on school property and driving on a suspended license.

“It was determined that the rifle magazine contained 29 rounds of 7.62,” investigators said in the report.

A preliminary hearing is set to take place Tuesday, Sept. 27.

EDITORS NOTE: The term ‘assault rifle’ is used in the incident report.