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BROOKLYN — A 14-year-old fled after a loaded gun was allegedly found in his backpack as he went through metal detectors at a high school in Brooklyn on Monday, officials said.

Officials say this gun was caught as a teen tried to bring it inside W. H. Maxwell Career & Technical Education High School in Brooklyn on Oct. 15, 2018. (School safety sources)

The teen was entering W. H. Maxwell Career & Technical Education High School on Pennsylvania Avenue, bordering Cypress Hills and East New York, around 10:25 a.m. when the incident occurred, said officials with Local 237, a union representing New York City government agencies.

Metal detectors alerted officials to a .25-caliber firearm located in the 14-year-old boy’s book bag, union representatives said.

The gun was loaded, according to police.

The teen allegedly fled as the bag was scanned.

He was last seen wearing a hoodie with a Nike logo and black do-rag.

As of Tuesday afternoon, police said there were still no arrests and the incident remained under investigation.