four train passengers are dead and a suspect is under arrest after a mass shooting that spanned two train cars in a Chicago suburb we get details now from cbs's terara Molina an early morning Nightmare on a train just outside Chicago you got multiple four passengers found shot three dead on the local Blue Line train another who died at a nearby hospital the shooting appears to be random police say there was no known motive it's a horrible situation you know it's definitely something that you don't want to wake up to you know it's a Monday morning on a holiday the Blue Line originates at Chicago's O'Hare Airport the shooting happened as the train was pulling into the suburban community of Forest Park the Chicago Transit Authority called it a heinous and egregious act of violence police have not released names or ages of the victims investigators say surveillance video LED them to arrest a suspect who was on a different train police recovered a weapon and they tell us those victims may have been sleeping when they were shot there is surveillance video of this incident and those who have seen it tell me it is both shocking and hard to watch Nancy I can imagine Tara Molina in Forest Park Illinois thank you so much