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PHILADELPHIA (CBS) — Police are investigating a deadly stabbing that left a 20-year-old man dead in West Oak Lane on Saturday morning.

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The attack happened at approximately 10:20 a.m. on the 6600 block of Limekiln Pike in North Philadelphia.

An investigation revealed the victim was allegedly stabbed in the buttocks with a butcher knife by one of three women in the group.

A large man was also involved in the attack.

Police initially thought the weapon was a hammer.

The man was taken to Einstein University Hospital by police where he was placed in critical condition but later died.

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No word on what motivated the attack.

No suspects are in custody.