They heard the call of duty. A pair of unarmed U.S. Marines brought down a suspected Moroccan terrorist aboard a high speed train in northern France. Interior Minister Bernard Cazeneuve said the Americans almost certainly averted disaster when they tackled the 26-year-old gunman who had opened fire with an assault rifle with 550 people on board. The attack occurred at around 6pm local time, approximately 150 miles north of Paris. The unnamed suspect was reportedly carrying nine clips holding 300 rounds. One of the Marines was shot in the incident and is reportedly in critical condition.