Authorities in New York City said they prevented a potential high school shooting after the FBI, acting on a tip, alerted them to a social media post that appeared to threaten to “shoot the school up,” officials said Thursday. The 16-year-old student was arrested at Queens’ Benjamin Cardozo High School after he was found with a .9 mm handgun that had 13 rounds in the magazine, New York City Police Commissioner Jessica Tisch told reporters. Tisch did not say what charges the so

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