One of the American soldiers who restrained the attacker on the train said that it appeared his weapon was faulty.
Alek Skarlatos, 22, said: "If that guy's weapon would have been functioning properly I don't even want to think about how it would have went." He also said that the attacker did not seem to know how to handle the gun properly.
Mr Skarlatos told Sky News: "I grabbed the handgun, got the handgun away from the guy and threw it. Then I grabbed the AK which was at his feet and started muzzle-thumping him in the head with it.
"Everybody just started beating on the guy while Spencer held the choke hold, until he went unconscious at that point. People started to restrain him." Mr Skarlatos - who said that everyone was just reacting on "adrenaline" - picked up the AK-47 and checked the other cars to ensure there was not another gunman.
Mr Skarlatos returned to car 12, where it all started, cleared the weapons and put them in a pile.
He told Sky News: "I noticed when I removed the round in the chamber of the AK that the primer had been struck, which means he pulled the trigger on the AK.
"The primer was just faulty, so the gun did not go off, luckily, and he did not know how to fix it, which was also very lucky.
"When I cleared the handgun I also noticed that there was no magazine in it - so he had either dropped it accidentally or did not load it properly. He was only able to get what appeared to be one shot off with the handgun."
Thanks for that. Some of it was new to me.