The FBI has said it has found no evidence that threats made to two Air France jets were credible.
Two flights from the US to Paris landed safely after being diverted.
Authorities carried out full inspections on the aircraft, their passengers and their luggage.
Two Air France flights bound for Paris from the US have been diverted because of anonymous threats made after take-off.
Air France said Air France Flight 65, from Los Angeles International Airport to Charles de Gaulle Airport in Paris, was diverted to Salt Lake City International Airport on Tuesday night local time. Salt Lake airport officials said the plane had received a phone threat.
At about the same time a second flight, Air France 55, took off from Dulles International Airport outside Washington and was diverted to Halifax in Nova Scotia, Canada.
Passengers got off both planes safely and were taken to terminals. Authorities in both the US and Canada were preparing to search the planes with dogs, officials said.
The FBI was taking over the investigation of the plane in Salt Lake City, which was diverted because of a threat received by phone after take-off, Salt Lake airport spokeswoman Bianca Shreeve said.
Keith Rosso of Santa Monica, California, a passenger on the flight from Los Angeles with his fiancee, said “everything was smooth, everything was great, everything was going swell” for the first two hours of the flight, then things changed.
“The flight attendants quickly came by and cleared plates, then there was an announcement that we were making an emergency landing and that the flight attendants were trained exactly for situations like this.”
He said he looked at the flight monitor at his set and “we had made a pretty sharp right turn – we had been almost near Canada – toward Salt Lake City”.
Mr Rosso said in FBI agent interviewed passengers after the landing.
In Halifax, the Royal Canadian Mounted Police was leading the investigation.
RCMP Constable Mark Skinner said there were 262 people on board that plane, which also received an anonymous threat. No further details on the threat were released.
“We received a complaint of a bomb threat and we responded to it,” Constable Skinner said. “They have to go to through the plane. I don’t think there is any timeline on when that plane might get back in the air.”
The threats came after last week’s attacks in Paris that killed 129 people and heightened security concerns around the world.
It is reported one of the planes has been cleared to fly and passengers are being boarded onto the flight again.
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