In this unbelievable and tragic footage, a train is shown tipping off of its tracks into a deadly crash. At least 80 people have been killed. According to NBC News, the driver of the train was put under formal investigation Thursday after security video showed it derailed after speeding around a tight curve.
High speed is a possible cause of the crash, sources told Reuters. Surrounding hospitals are treating the 178 injured. Among them are five Americans.
Spain has declared three days of national mourning over the crash. (Video courtesy of CBS.com)
