A 17-year-old boy with a loaded handgun tucked inside his waistband was busted at his Brooklyn high school Monday morning, authorities said.

The teen was packing the loaded 9 mm handgun inside East Brooklyn High School on Kings Highway near East 96th Street in Flatbush just before 10 a.m., cops and sources said.

Another student spotted the firearm and quickly alerted teachers, who called 911, according to the sources.

The teen was found carrying a loaded gun in his waistband inside East Brooklyn High School on Kings Highway, cops said. Kyle Mazza/Shutterstock

Another student alerted teachers after spotting the handgun, sources said. Kyle Mazza/Shutterstock

The gun was recovered and the boy was taken into custody at the scene, with charges pending.

The school does not have metal det

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