An American Airlines flight carrying 179 people from Manchester, England, to Chicago has been diverted to Bangor, Maine because of security concerns.
The US Transportation Security Administration said it learned of what it called "a reported threat to the aircraft while it was en route."
Authorities said the plane landed in Bangor about 5am on Saturday.
All the passengers have left the plane and the US Federal Bureau of Investigation is now interviewing the pilot, the crew and passengers.
The exact nature of the security concerns have not yet been released.