Mass Casualty Incidents | Slideshow

California Commuter Train Derailment

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Commuter Train Derails

In this image provided the Alameda County Fire Department, first responders work the scene after a car of a commuter train plunged into Alameda Creek after the train derailed Monday, March 7, 2016, in Alameda County, Calif., about 45 miles east of San Francisco. Crews had to fight the creek's fast-moving currents to pull riders from the partially submerged rail car, Alameda County Sheriff's Sgt. Ray Kelly said. (Aisha Knowles/Alameda County Fire Department via AP) MANDATORY CREDIT

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APTOPIX Commuter Train Derails

In this image provided the Alameda County Fire Department, first responders work the scene after a car of a commuter train plunged into Alameda Creek after the train derailed Monday, March 7, 2016, in Alameda County, Calif., about 45 miles east of San Francisco. Crews had to fight the creek's fast-moving currents to pull riders from the partially submerged rail car, Alameda County Sheriff's Sgt. Ray Kelly said. (Aisha Knowles/Alameda County Fire Department via AP) MANDATORY CREDIT

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Commuter Train Derails

In this image provided the Alameda County Fire Department, first responders work the scene after a car of a commuter train plunged into Alameda Creek after the train derailed Monday, March 7, 2016, in Alameda County, Calif., about 45 miles east of San Francisco. Crews had to fight the creek's fast-moving currents to pull riders from the partially submerged rail car, Alameda County Sheriff's Sgt. Ray Kelly said. (Aisha Knowles/Alameda County Fire Department via AP) MANDATORY CREDIT