CHICAGO - A Federal Aviation Administration spokesman says an unknown number of minor injuries have been reported after an American Airlines plane caught fire and passengers evacuated on the runway at Chicago's O'Hare International Airport.

FAA spokesman Tony Molinaro initially said no one was hurt but later said minor injuries were reported. He said he could not give an exact number.

Molinaro says the pilot aborted takeoff and everyone evacuated. Television reports showed a large plume of black smoke coming from the Boeing 767.

A National Transportation Safety Board spokesman says the board is aware of the incident but hasn't made a decision on whether to investigate.

Video shows people deplaning AA flight while it was on fire at O'Hare due to engine-related mechanical issue. https://t.co/jtNh1tJx1a pic.twitter.com/9jVsUGSYAD

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