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PHILADELPHIA (CBS) — Philadelphia police are trying to track down who stabbed a man and a teenager in Frankford.

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The attack that happened as a birthday party turned violent on the 5400 block of Akron Street around 1:30 a.m. Sunday.

A 19-year-old man is in critical condition after he was stabbed six times in the back.

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A 17-year-old boy is in stable condition with stab wounds to the stomach and arm.

So far, there is no word on the motive for the attack.