Authorities say the gunfire erupted around 1 a.m. outside the Hamilton Mall on East Black Horse Pike near the entrance to the Macy's store.
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VIDEO: Deadly shooting outside mall
Officers arrived to find a 20-year-old man from Atlantic City, N.J. who had been shot multiple times.
He was pronounced dead at the scene.
They found a 26-year-old man from Clayton, N.J., identified as the brother of the deceased, who had been shot in the leg.
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Medics rushed that victim to AtlantiCare Regional Medical Center-City Division, where he was listed in stable condition.
The names of the victims have not been released.
The circumstances surrounding the shooting were not immediately clear.
VIDEO: Shooting outside NJ mall
The mall appeared to open at 6 a.m., as scheduled, for Black Friday shopping.