Violence struck Queens’ troubled John Bowne High School again on Friday, marking the third day of disturbances in a week of unhappy events for students and staff at the Flushing school.

School safety agents who conducted random metal-detector scanning busted a student with a butterfly knife at 7:50 a.m. that day, as well as two other students packing smaller knives with blades shorter than 4 inches.

Police issued a desk appearance ticket to the student caught with the butterfly knife, identified by cops as a 16-year-old boy from Flushing.

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