No you to that frightening incident high in the sky. A passenger screaming he was poisoned on an international flight. His fellow passengers racing to subdue him and holding him down until they could... See More
No you to that frightening incident high in the sky. A passenger screaming he was poisoned on an international flight. His fellow passengers racing to subdue him and holding him down until they could land. Abc's gio benitez is here with this very frightening moment. Reporter: It is, robin. Good morning to you. For the first time we're seeing and hearing that man as he throws a tantrum on the airplane. It was on the last leg of a very long flight and passengers weren't taking any chances. This is the man federal authorities believe terrified passengers in the middle of a 15-hour united airlines flight from hong kong to newark monday. Somebody help me. Divert, divert, divert. Reporter: His hands zip tied. His face hidden by a hoodie daniel perry was quickly put into an ambulance by fbi agents waiting on the tarmac after passengers say he started screaming that he had been poisoned. They're trying to take my things away. They're trying to inject me. They're trying to kill me. Reporter: Along with a flight attendant and other passengers jacques roisen jumped into action jumping on top of that man then restraining him with plastic handcuffs for the flight's remaining six hours. He saw everybody as a threat. He thought everybody was working for the fbi, the cia. Reporter: Roizen says the suspect believed to be american says he knows state seeks just like edward snowden, the whistle-blower who leaked nsa secrets. There was no time to understand or think, you know, we needed to restrain him. Reporter: Passengers have reason to be on edge recently. On friday a man aboard a frontier air flight to denver claimed to have a bomb inside his backpack. We were just extremely scared, worried. I can't even describe how fast my heart was beating. Reporter: On saturday another scare. A threatening note found in the bathroom of an egypt air flight. That made an emergency landing in scotland. No bomb was found on either plane. And the fbi says the man from monday's united flight is in a hospital this morning undergoing a psychiatric evaluation. In that video you saw, he shouted out his name, birthday, social security number, even his mom's phone number and while it appears he never posed any real threat, the scare has left many on board shaken, rob and george. Understandably so. How many types have we seen how quickly passengers react. Cuffs. Turn to josh elliott.
This transcript has been automatically generated and may not be 100% accurate.