COLORADO SPRINGS, Colo. - Colorado Springs police issued a citation to a Vista Ridge High School student accused of putting Visine eye drops into a salad dressing that was then eaten by students during lunch on Monday.

Police cited the student on charges of reckless endangerment and interference with staff, faculty or students of an educational institution, according to KRDO.

D-49 District spokesperson, Stephanie Wurtz Meredith told KRDO one student reported seeing a male student squeeze the contents of a Visine bottle into a container of ranch dressing.

Wurtz Meredith said when school officials confronted the student he said the Visine bottle only contained water. The Visine bottle had been thrown out and officials could not find it to determine if it was contaminated, she said.

"We still have not been able to confirm what might have been in the ranch dressing," Wurtz Meredith told the Colorado Springs Gazette.

Wurtz Meredith said about 20 students out of the 75 in the cafeteria during lunch reported to be suffering possible symptoms after they were told what happened, the newspaper reported.

Paramedics were called to the school and monitored the students for two hours, but none became ill, the Gazette reported. Students who reported possible symptoms were released to their parents.

Parents were notified that potential poisoning symptoms include: Nausea, dizziness, low body temperature and low blood pressure. They were told to contact their doctor if their children came down with any of those symptoms.

School officials said the student also faces disciplinary action under school district guidelines.