By Kristen Johanson

PHILADELPHIA (CBS) — Philadelphia police are investigating the stabbing of a 22-year-old man in a popular Center City neighborhood.

The incident happened just before 3 a.m. Sunday at 15th and Sansom Streets.

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The victim was stabbed once in the chest and was taken to Hahnemann Hospital.

Officials says he remains in critical condition.

No arrests have been made.