NEW YORK (CBSNewYork) -- Police a searching for two men and a woman after an unprovoked slashing aboard a subway in Manhattan.

According to police, the victim, a man in his 40s, was riding on a southbound 4 train near 59th Street/Lexington Avenue just after 1:30 p.m. on Tuesday. They say two men and a woman attacked the victim, with one of them slashing the victim in the head.

Sources tell CBS2 the victim told police the attack was unprovoked and he didn't know his attackers.

The suspects got off at 59th Street.

The victim was rushed to Bellevue Hospital for treatment and is expected to survive.

It is yet another example of the violence we have seen in the subway lately.

Police are still looking for those attackers. So far we haven't seen any pictures or videos of them.

CBS2's Nick Caloway contributed to this report.