By Selim Algar

Three guns were confiscated from city students inside high school buildings in a matter of hours Wednesday — two in the Bronx and one in Brooklyn, sources told The Post.

An 18-year-old student refused to pass through a metal detector at the Mott Haven Educational Campus in the Bronx where scanners are installed on random days, according to law enforcement sources.

He ran from the building and attempted to hide a .22-caliber pistol in his backpack, sources said.

After the building was placed on lockdown, the gun was recovered by school staffers without further incident.

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