Antioch police said the gun was found during a regularly scheduled canine search of vehicles at Antioch Community High School. The weapon was seized, and the student whose car it was inside was taken into custody, police said.
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Police said there is no reason to believe there was ever a threat to the school.
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The suspect is a 21-year-old part-time student, who participates in an alternative schooling program, police said.
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He remains in Antioch police custody, while the investigation continues.