A 16-year-old boy was arrested for allegedly bringing a gun to the Menlo-Atherton High School campus during its graduation ceremony, according to the Atherton Police Department.

The suspect is from Redwood City and does not attend the high school, according to the department.

While serving as security detail at the graduation ceremony on June 6, Atherton police officers were alerted by the school’s security guard that a fight had broken out in a wing of the school, said Cockler Anthony, a detective sergeant with Atherton police.

When police responded to the fight at about 5:30 p.m. on June 6, the suspects fled and one tossed a grey sweatshirt into nearby bushes.

Police chased down the suspect who allegedly discarded the sweatshirt and detained him.

Upon further inspection of the sweatshirt, officers found a .40-caliber Glock style handgun wrapped inside of it, along with a 15-round magazine carrying three rounds of ammunition, Anthony said.

The high school’s graduation ceremony, which was underway on the school’s football field at that time, was not interrupted by the incident, Anthony said.

The suspect who allegedly tossed the gun was booked into the San Mateo County Juvenile Hall on charges of possessing a firearm in a school zone, being a minor of in possession of a firearm, ammunition and magazine, resisting arrest and a juvenile probation violation, Anthony said.

The San Mateo County Juvenile District Attorney’s Office will be reviewing the case.