CHELSEA, MASS. (WHDH) - A 16-year-old student is in custody after officials said he brought a gun into his Chelsea charter school hours before the graduation ceremony.

A Phoenix Charter School administrator noticed the loaded 9mm gun on the student’s waist and was able to take it from him without incident, according to a post on the Chelsea Chief of Police’s Twitter page.

“We were able to contain the incident, the staff really handled it well,” school CEO Beth Anderson said. “Chelsea police have assured us as best they can that they have no reason to believe that there is any more risk of harm to this school or any other place in Chelsea.”

The student was placed into police custody around 2:30 p.m., Chief Brian Kyes said. Now, investigators are working with the Bureau of Alcohol, Tobacco, Firearms and Explosives to trace the gun’s origins. According to police, the gun is not registered in Massachusetts and it has not been reported stolen.

The school was able to continue normally and a lockdown was not put in place. A sweep was conducted to ensure students’ safety.

This comes in the wake of a number of recent mass shootings that have left the nation on edge.

“Given recent national events, the school had recently reviewed its safety policies and procedures, ensuring that we have strong security measures in place to create a safe environment for our students,” according to a statement issued by Phoenix Charter School officials.

So far, it is unclear why the student brought the gun to school in the first place.

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