It happened around 10 p.m. on the stairway of the PATCO high-speed line at 15th and Locust streets.
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Police say a man in his 30s was rushed to an area hospital after being stabbed 11 times. He is currently listed in critical condition.
SEE ALSO: Man stabbed inside Wawa in Philadelphia's Mount Airy neighborhood
It's still unclear what sparked the attack.
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No arrests have been made.
Anyone with any information is asked to call police at 215-686-TIPS.
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