Eight passengers on an All Nippon Airways flight were sickened Monday at Narita airport in Chiba Prefecture after smoke filled the cabin, triggering an evacuation, officials from the airline and airport said.

The trouble occurred at around 9:45 a.m. on an ANA Boeing 767 bound for Hong Kong with around 140 passengers and crew on board, they said.

According to the airline, oil from the plane's auxiliary power unit was sucked into the cabin through the air conditioning ducts after vaporizing.

While the cause of the leak has not been determined, no fire occurred, ANA said.