According to police, Jermaine McAllister, 23, of Philadelphia, was attempting to make a drug purchase when another man, Ivairve Cotto, 25, of Reading, attempted to rob him.
Investigators say they both shot each other, and were taken to the hospital.
Both were pronounced dead.
Cotto's death was ruled a homicde and McAllister's death was ruled a casualty of self-defense.
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