UNIVERSITY PARK, Texas—A high school in a suburb of Dallas cancelled classes Wednesday afternoon after a box of bullet shells was found in the boys’ bathroom.
Authorities at Highland Park High School originally said they were not going to dismiss students early but changed their mind.
No weapon or note was found with the box.
One student was taken into custody after trying to leave campus.
However, police say that teen is not connected to the shells and was told to leave campus by their parents.
The incident is the fifth security breach on campus in the last month.
The school was dismissed early Tuesday after a threatening note was found.
In January, classes were dismissed early twice after three threatening notes were found in a boys’ bathroom on consecutive days.
If the incidents are connected, the responsible person could face felony charges.
The University Park police and the FBI are investigating.