A man was fatally stabbed inside a Bronx subway station early Monday, cops said. 

The victim, who was not identified, was arguing with another person on the mezzanine to the No. 2 train at the Wakefield-241st Street station around 12:40 a.m. when the suspect stabbed him in the torso, police said. 

The victim was rushed to Montefiore Medical Center, where he was pronounced dead. 

His alleged attacker fled, cops said. 

The nature of the argument was not immediately clear.