Two aviation security officers involved in the April incident in which a 69-year-old doctor was violently removed from a United Airlines flight have been fired. The doctor, David Dao, suffered a broken nose, the loss of two teeth, and a concussion in an event that went viral on the Internet after it was captured by passengers' mobile phones.

The Chicago Department of Aviation did not release the names of the officers who were fired. Another resigned and a fourth official was briefly suspended in the O'Hare International Airport episode, in which Dao had refused to give up his seat on a flight to Louisville that was overbooked. He was forcibly removed. Dao later sued the airline and settled for an undisclosed amount. The ordeal also prompted United's CEO, Oscar Munoz, to publicly apologize.

Chicago's inspector general on Tuesday confirmed earlier reports that the officers involved had suggested that it was Dao's fault that he struck his face on an armrest before he was dragged off the plane.

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