BROOKLYN, New York (WABC) -- A search is underway for a man who struck a teenager in the head with a glass bottle while on a subway train in Brooklyn. Police say the 18-year-old woman and the suspect got into an argument Wednesday at around 8 p.m., while on a northbound "N" train. The man then grabbed a liquor bottle, hit her on the forehead with it, then got off the train at 4th Avenue and 36th Street. The victim suffered a cut to her forehead. She was rushed to NYU Langone Hospital-Brooklyn. She was treated and released. The attacker is described as a man in his 20's, with a medium complexion, approximately 5'7" tall, weighing 130 lbs., with a slim build and a ponytail.