BERKELEY TOWNSHIP, N.J. (AP) — A New Jersey high school student accused of lacing his Spanish teacher’s iced coffee with saline solution has been charged with aggravated assault.

Authorities say it happened Tuesday morning at Central Regional High School in Berkeley Township. They say the student was released to his parents’ custody, pending a juvenile court hearing.

School officials say the teacher had gone into a hallway, leaving her coffee at her desk, when the student poured a few drops of saline solution into the cup. The teacher drank the coffee and started feeling stomach discomfort. She was treated at a hospital.

Ingesting saline solution can lead to nausea, vomiting, restricted breathing and a coma.