New York City authorities responded to a track fire near Astor Place in Manhattan on Tuesday morning, causing significant disruptions to subway service. The city's emergency notification system advised commuters to expect delays and service changes on Brooklyn-bound 4 and 6 trains between Astor Place and Lafayette Street in Manhattan and into Brooklyn. Local news outlet WABC reported that injuries had occurred as a result of the incident. This is a developing story, and updates will be provided as they become available.