BOYNTON BEACH, Fla. (CBS Tampa) – A local teen faces at least 20 counts of simple battery and culpable negligence after going on a rampage and sticking almost two dozen of her fellow students with her glucometer and a sewing needle.

On Tuesday morning, the unidentified 13-year-old girl became upset after being hit in the face with a ball during gym class, the Florida Sun-Sentinel reports.

The girl reportedly told police that her classmate was bullying her.

So when the class boarded a bus to go back to the school campus, the girl reportedly used her glucometer – a device used by diabetics to measure blood glucose – and a sewing needle to stab several students in their arms and necks during the ride back.

The attacks allegedly continued once the girl was back in the school building.

She only stopped when one of the attacked children went to a teacher, who subsequently involved the principal, the paper learned.

Officers with the Boynton Beach Police were called to the scene, in addition to paramedics. Upon investigating, it was discovered that the girl had stabbed at least 20 students, all of whom were either 13 or 14 years of age, in several different parts of the school – including the hallway.

The Sun-Sentinel reports that the parents of the stabbed students were quickly notified, and given the option of picking their child up from school. It was recommended to parents that the children be taken to their primary care physicians.

“The issue is the exposure to the needle,” Stephanie Slater, Boynton Beach police spokeswoman Stephanie Slater, told the paper.