Police: Suspect wanted for robbing, slashing victim on 4 train

A suspect is wanted for robbing and slashing a victim Saturday morning on a northbound 4 train.
Police say the suspect approached the victim and attempted to rip off their necklace.
The victim fought back and part of their left index finger was severed during the attack.
The suspect fled the train as it pulled into the 170th Street station, according to authorities.
Police say the victim was treated for their injury and is expected to recover.