WATCH: A brief documentary produced by the Fire Department of the City of New York in the aftermath, at what was then, the deadliest day in FDNY history. 12 FDNY Firefighters were killed in the line of duty on October 17, 1966, an incident that has come to be known within the Department as the “23rd Street Fire.” Visit the FDNY Facebook page on Monday, October 17, 2016, at 12:15 pm EST, to watch a live stream of the 50th Anniversary Commemoration Ceremony to be held at the scene of the fire on 2