NORRISTOWN, Pa. (CBS) — Police are searching for the person who stabbed a woman multiple times overnight in Norristown, Montgomery County.

It happened shortly after 1 a.m. Saturday in the 600 block of West Lafayette Street.

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Authorities say the woman was stabbed numerous times in the chest and arm.

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She was airlifted to Penn Presbyterian Hospital in Philadelphia in unknown condition.

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Investigators say they do not believe the victim knows her attacker.