Two officers have been fired in the United Airlines incident in April when a passenger was dragged off a flight at Chicago O'Hare International Airport, the Chicago Tribune reported.
In line with rules governing the Inspector General's Office, the report didn't reveal the disciplined officers' identities.
The names of the officers were withheld, as is the norm when employees are fired, and were referred to according to their ranks. Evans said aviation security officers would still be able to board planes in medical emergencies.
One of the suspensions was reduced to two days after a grievance was filed.
As he was pulled from his seat, Dr Dao's head hit an armrest and as he was dragged down the aisle with his face streaming with blood from a broken nose, his glasses slipped off and his shirt rode up his chest.
The latter two had been causing "false statements" and "significant omissions" for the other.
The inspector general inquiry said that officers had "deliberately removed material facts from their reports". In July, it decided the Chicago Police Department would respond to airport disturbance calls over security officers.
The chairman of the City Council's Black Caucus has demanded that aviation security officers continue to undergo four months of training at the police academy and retain their titles as police officers.
The aviation department confirmed that a review of its policies and procedures was being conducted. The city also had the word "police" removed from security officer uniforms and vehicles.
Ferguson noted that both of the fired officers have "grieved their discharge" with arbitration dates not yet scheduled. The airline needed several seats on the full plane to get crew members in position for their next flights. The ordeal also prompted United's CEO, Oscar Munoz, to publicly apologize. In addition, passengers on the flight, which was delayed about three hours, received refunds.
Thomas Demetrio, Dao's attorney, said that the case is "a lesson to be learnt" for law enforcement, reports CNN. He was joined by the passenger's daughter. He would need reconstructive surgery for damaged sinuses, Demetrio added.
Despite Dao's plea, the airline insisted and as a result, they sent security onto the plane, where they were told to remove him from the aircraft. A few days after the incident, Demetrio held a news conference at a packed ballroom in Chicago's Union League Club where he was joined by the passenger's daughter.