Police in Holliston, Massachusetts, say a middle school student posted a video on Snapchat on Saturday waving around a gun and pointing it at the camera.
Police said the child at Robert Adams Middle School made no specific threats, but they take the matter very seriously and are investigating.
Authorities are trying to figure out if the gun is real, who the gun belonged to, and how the child got his hands on the weapon.
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Police say they are working with Framingham and Boston Police to determine the source of the video.