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PHILADELPHIA (CBS) – The search is on for a gunman who walked up to a car and shot a woman in the head in Southwest Philadelphia. Police say two women were talking in the car at 52nd Street and Woodland Avenue when a man approached them and shot the passenger.

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She’s in critical condition at this time.

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The driver was not injured.

It’s not yet clear what led to the shooting.

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Stay with CBSPhilly.com for this developing story.