The 16-year-old boy caught with a loaded gun at a Queens high school Thursday was slapped with charges, officials announced Friday as they revealed that the weapon marked one of 4,000 taken off the city’s streets so far this year.

The Benjamin Cardozo High School student was charged with criminal possession of a weapon and making a terroristic threat as an adolescent offender after cops found him toting a semi-automatic handgun in his backpack, Police Commissioner Jessica Tisch told reporters at a morning press conference.

The 9-millimeter Taurus GX4 – loaded with 13 rounds in the magazine – was seized just over two hours after the teen allegedly posted an ominous Instagram photo threatening that he was “Boutta Shoot the School Up.” 4

The swift investigation also led cops to the

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