The incident happened just after 7 p.m. at a Sunoco gas station located at 2990 Boston Road in the Allerton section.
Police say the 49-year-old male employee was approached by a man who shot him in the head and fled from the scene.
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The victim was taken to a nearby hospital where his condition was said to be improving. Police say they expect him to survive.
They say the suspect was last seen wearing a sweatshirt.
So far there have been no arrests.
Police are looking into what led to the shooting.
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