It happened around 3:30 Saturday afternoon in the unit block of Bunting Lane.
Police say a 21-year-old woman was inside her home when she was shot in the stomach.
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She was taken to Crozier-Chester Medical Center in critical condition. After undergoing surgery she was upgraded to good condition.
Her 24-year-old boyfriend is in police custody.
Police say he faces aggravated assault and reckless and endangerment charges.
Police have not yet released the identity of those involved.