A US domestic flight has made an emergency landing after the captain was restrained because of "erratic behaviour", officials say.
Passengers said the captain left the cockpit and began to rant about a bomb and threats from Iran and Al-Qaeda.
He was reportedly subdued when he tried to re-enter the cockpit, which had been locked by the co-pilot, officials said.
JetBlue flight 191 from New York to Las Vegas was diverted to Amarillo, Texas, after the incident.
The airline said the pilot in charge of the plane, which was carrying 135 passengers, decided to land at about 10:00 local time (16:00 GMT) after a "medical situation" involving the captain.
The flight touched down in Amarillo 10 minutes later, JetBlue said in a statement, and a new aircraft later arrived to take passengers on to Las Vegas.
Police and the FBI are investigating the incident.