The incident happened Saturday just after 6 p.m. inside a car on the 4200 block of Fairmount Avenue.
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Police sources tell Action News the boy's father went into a barbershop to get a haircut and left his son in the car with a gun.
He is being charged with gun charges, endangering the welfare of a child, and reckless endangerment.
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No further details have been provided at this time.