NEW YORK, NY – A group of teens wearing ski masks assaulted and slashed a 48-year-old man riding the northbound B train at around 4:20 pm Wednesday in Manhattan. The teens engaged in an argument with the man and began to punch and beat him. At least one teen pulled a knife or other sharp object and slashed him across the forehead. The teens were captured on video exiting the subway at the Cathedral Parkway station on 110th Street in Morningside Heights.