A knife-wielding commuter stabbed a passenger to death on the D train early this morning in a fight over a seat. Cops arrested a 37-year-old man suspected of repeatedly stabbing a 36-year-old man in the neck and face when the victim refused to move his bag from a seat on the northbound train at the 7th Avenue and 53rd Street station in Manhattan.

When the conductor became aware of the altercation at around 2 am, he didn't open train doors until police arrived. "The doors on the train were locked and the perp couldn't get away," a source told the Daily News. "That's how we got him." The victim was pronounced dead inside the train, "where pools of blood were left along the length of the first car," according to the tabloid. The names of the suspect and the victim have not yet been released, and it's unclear if they knew each other, according WCBS. The Post reports that "the killer was standing over his bloodied victim when the doors opened."