Two Air France flights headed from the US to France were diverted due to bomb scare, the media reported on Wednesday.
Both flights landed safely on Tuesday night.
Flight 65, from Los Angeles to Paris, was diverted to Salt Lake City after the bomb threat, CNN quoted a US government official as saying.
Another flight, Air France Flight 55 from Washington's Dulles International Airport to Charles de Gaulle Airport in Paris was diverted to an airport in Halifax, Nova Scotia -- also due to a bomb threat, a government source was quoted as saying in the report.
"Several law enforcement agencies are working ... to determine the nature of the threats which caused the aircraft to divert," FBI Special Agent Todd Palmer said.
No US military aircraft were scrambled in either incident, an official said.