Flight 65, an Airbus A-380 that departed from Los Angeles landed safely in Salt Lake City, where passengers and crew were being taken off the plane and escorted into the terminal, an FAA spokesman said. The Salt Lake Tribune, citing an airport official, reported the plane was carrying 497 passengers and crew.

A separate flight that left Dulles International Airport outside Washington, D.C., Flight 55, was diverted to Halifax International Airport in Nova Scotia, where passengers and crew had also disembarked. The Halifax Airport tweeted that 262 passengers and crew members had been aboard.

In a brief statement, Air France said both flights had been the "subjects of anonymous threats received after their respective take-offs." "As a precautionary measure and to conduct all necessary security checks, Air France, applying the safety regulations in force, decided to request the landings of both aircraft," the airline said in its statement.

Security officials have been on high alert since last week's deadly attacks in Paris, claimed by Islamic State militants, killed 129 people. Russia has said the group was also responsible for the downing on Oct. 31 of a plane returning to St. Petersburg from the Sharm al-Sheikh resort in Egypt, killing all 224 on board.

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