PATERSON, NJ - A 26-year-old city man was stabbed four times in the back Wednesday night in the area of 15th Avenue and E. 25th Street, police said.

Authorities are unsure of the circumstances of the attack and do not have much of a description of the suspect because the victim, whose name was not released, has been undergoing medical treatment and detectives have had limited opportunity to talk to him, according to Lt. Richard Reyes. 

The man's friends found him on the ground and drove him to the hospital, Reyes said. Police learned of the incident when the victim showed up at the emergency room.

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The investigation is ongoing, Reyes said.