It happened around 8:30 p.m. in the area of North Marshal Street & W. Nedro Ave.
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Police tell Action News that officers responded to a reported fight and found four women suffering from stab wounds. One of the women is listed in critical condition at an area hospital.
Chopper 6 over quadruple stabbing in Philadelphia
The other victims, including a pregnant woman, suffered minor injuries.
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Police say a fifth female victim was injured after she was hit with a baseball bat.
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It's still unclear what sparked the fight.
No arrests have been made at this time.
Anyone with any information is asked to call police at 215-686-TIPS.