Sadler and Alek Skarlatos — seen here on the left and middle — were on board the train when someone confronted the gunman, who opened fire with a handgun.

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Their other friend, Spencer Stone, then put the man in a chokehold, preventing him from firing his automatic weapon. (Video via Fox News)

Skarlatos is a National Guard specialist who recently served in Afghanistan, and Stone is an airman first class in the Air Force. (Video via NBC)

Stone also helped treat a passenger who sustained a serious neck injury during the incident. Stone remains in the hospital after the gunman pulled a knife and cut him trying to get free.

The motives of the gunman have not been officially confirmed, but officials believe he is a 26-year-old Moroccan man who was known to authorities in France, Belgium and Spain. He was identified by a French official close to the investigation as Ayoub El-Khazzani.

– The Associated Press contributed to this report. This video includes images from Getty Images.

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Toi Cliatt, Trina Martin and her son, Gabe Watson, say they were traumatized when an FBI SWAT team raided their Atlanta home by mistake in 2017. (Courtesy of Institute for Justice)

Credit: Courtesy Institute for Justice