Police say the shots rang out around 11:30 p.m. Thursday in the area of 8th and Cambria streets.
Officers recovered five spent shell casings from the scene.
A 34-year-old woman was shot in the foot, a 24-year-old man in both legs and a 36-year-old man shot in the back.
Police believe the victims were on the sidewalk, with one sitting in a folding chair at the time of the shooting
There has been no word yet on a motive.
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