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A United Airlines flight was diverted to Cuba on Sunday after its crew reported a strong odor in the plane, U.S. aviation and airline spokesmen said.

Federal Aviation Administration spokesman Les Dorr said United Flight 831, an Airbus A320, landed safely at Jose Marti Airport in Havana at 12:07 p.m. local time.

The flight had left Washington Dulles airport, located in northern Virginia, just before 9 a.m., according to United's website. It was supposed to land at 11:27 a.m. in Cancun, Mexico.

But crew members "noticed an unfamiliar smell in the cabin," said United Airlines spokesman Charlie Hobart. Dorr noted that the crew detected a burning smell, saying it was in the cockpit.