PHILADELPHIA (CBS) — Police are investigating a home invasion in North Philadelphia that ended in gunfire.

Officers say just before 1:30 a.m. Friday, two armed men broke into a home on the 3000 block of North 23rd Street.

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When one of the residents ran for the front door, she was shot in the back.

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She is in critical condition.

Police are now questioning two men.

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They have no motive yet.