Trio of Americans Credited With Helping Stop Gunman on Paris-bound Train

ABC News' David Wright reports the latest from France.
2:34 | 08/23/15

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Transcript for Trio of Americans Credited With Helping Stop Gunman on Paris-bound Train
We are back now with those American heroes who took down a terrorist in France, unarmed, unafraid. They acted on instinct wrestling away an assault weapon as the attacker slashed them with a knife. Authorities say they prevented a massacre, and ABC's David Wright is in Paris with the latest details on their stunning bravery. Good morning, David. Reporter: Good morning, George. You're right, stunning is the word for it. These three Americans were vacationing here in France, two service members and a college student, childhood friends who were on that train bound for Paris when a gunman burst into the car and started shooting. Without thinking of their own safety, they leapt into action. Slightly battered but clearly in good spirits, airman first class Spencer stone waved to reporters after being released from the hospital. He's one of three Americans being hailed as heroes for thwarting what could have been a deadly terror attack on a paris-bound train. Dude, I tried to shoot him. Reporter: The immediate aftermath captured on cell phone video. That's Spencer bleeding from the neck and hand after disarming the suspect, now hog tied on the floor, his arsenal of weapons nearby. Stone was on the train with two childhood friends army national guardsman alek skarlatos and a college student, Anthony Sadler, when the gunman emerged from the bathroom wielding an ak-47. We see the gunman enter the back of the train with the ak in his hand, and he's cocking it about to shoot it, and my friend alek just yelled, Spencer go. Spencer got to the guy first. Grabbed the guy by the neck, and I grabbed the handgun. We were scared for sure, but I mean adrenaline mostly just took over because I mean I didn't even have time to think. Reporter: A british businessman also made the split-second decision to help subdue the gunman. It was purely survival. I said to myself, okay, maybe I have a chance if I get up and I help, as well. Reporter: French authorities say the suspect identified as 25-year-old Ayoub el khazzani was on a security watch list, thought to have ties to radical islamist groups. This country is, of course, still on high alert after the deadly "Charlie hebdo" attacks in January. The authorities here thankful that that scene was not repeated thanks to these quick-thinking Americans. Tomorrow, the French president plans to thank them personally at a ceremony here at the elysees palace. And they deserve every accumulate they get.

This transcript has been automatically generated and may not be 100% accurate.

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