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Three of the Chicago law enforcement officers involved in dragging a Louisville doctor off a United Airlines’ flight in April are no longer on the job, officials revealed Tuesday.

Chicago’s Inspector General Joseph Ferguson said an officer and an Aviation Security sergeant were fired, a third officer resigned and another received a five-day suspension — which was shorted to two days on appeal — for their involvement in the “violent forcible removal” of Dr. David Dao.

The report did not reveal the identities of the officers.

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Ferguson’s report says that the use of “excessive force” caused Dao to break his nose, lose two teeth and sustain a concussion, and noted that the security officer who pulled Dao from the flight broke department policy when he “escalated a nonthreatening situation into a physically violent one.”

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Dao refused to leave his Chicago-to-Louisville flight after he was told by United Airlines officials that his seat was needed for a crew member working a connecting route. Security officers surrounded his seat shortly thereafter.

A cellphone video that captured the bloody ordeal went viral, as the 69-year-old doctor can be seen being dragged along the narrow aisle floor by a security officer. Other passengers can be heard expressing their horror.

Passenger David Dao is dragged out of a United Airlines plane at O'Hare International Airport in Chicago on Monday, April 10, 2017. Tyler Bridges / Twitter

The distressing situation caused United Airlines CEO Oscar Munoz to issue a public apology and open an investigation into the matter, amid a growing public relations nightmare for the airline giant.

Dao and United Airlines reached an "amicable settlement" in late April.

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In Tuesday’s report, Ferguson also revealed that two security officers tried to cover for each other. He said one officer “made misleading statements in two reports” and the other “made material omissions in a report.”

The Chicago Department of Aviation said that it would review the Aviation Security Division’s policies and procedures. That review is expected to be completed by the first quarter of 2018.