United Airlines has said that the behavior of an "unruly passenger" caused the sudden diversion of a Hong Kong-bound flight from Chicago on Sunday. The incident occurred after the flight was in the air for nearly 12 hours.

Chicago-based United Airlines spokesman Charles Hobart said that the flight no 895 took off from O'Hare International Airport for Hong Kong after 2 p.m. The flight, however, made an urgent landing at Narita, one of Tokyo's busiest airports.

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Hobart said no injuries have been reported. He revealed added that there are 241 passengers and 15 crew members aboard the flight.

He confirmed that the flight has departed from Tokyo and is expected to land at Hong Kong airport anytime soon.

TagsUnited Airlines, Chicago, Chicago Flight to Hong Kong, injuries