A fire that broke out inside an underground subway station in Manhattan early Friday morning, killing a 36-year-old train operator, appeared to have been intentionally set, CNN and NBC New York report. Police reportedly have a person in custody for the incident, and the cause of the fire is still under investigation. However, officials reportedly found a burnt shopping cart filled with clothing and other items in the subway car where the fire is believed to have started. More than 15 others were injured in the incident, four of them reportedly in critical condition. The New York City Fire Department said a call about a train car fire at the 110th Street Central Park North subway station came in around 3:20 a.m. local time. An FDNY spokesperson said: “It’s in the subway station so there’s no ventilation or limited ventilation. Besides that, you have to get the hose lines down through turnstiles which are also secured and everything. It made it a difficult operation but that’s what we do.”