EDISON, NJ - Police are looking for three teenagers for vandalizing seven school buses parked behind a Jackson Avenue middle school, then returning again Tuesday night to spray paint more graffiti on the school’s American flag.

Teenagers set off fire extinguishers inside three school buses and spray-painted graffiti on the outside of four others at Herbert Hoover Middle School during nighttime hours over the past week, principal Brian McGrath told police on Tuesday morning.

On Wednesday morning, police were back at Herbert Hoover because the principal said vandals struck again overnight, damaging the school’s American flag with black and white spray paint, police said.

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“School security videos indicate these suspects are older teenagers or young adults, in the 15 to 18 age range,” said police Lt. Robert Dudash. They face multiple counts of criminal mischief and other potential charges.

The Detective Bureau is handling the police department’s investigation into the incidents. Anyone with information should contact the Edison Police Dept. at  (732) 248-7400.