CHICAGO -- Disturbing footage sent to WHAS-TV from viewers on social media shows a man forcibly removed from a United Airlines Flight headed from Chicago to Louisville on April 9.

The man was forced out of his seat by officials and dragged him down the aisle.

The following are tweets from two people on Twitter of the incident: 

The flight was overbooked, according to United Airlines, so the airline asked for volunteers to leave the aircraft.

This man said he had to get home and refused to voluntarily give up his seat and that's when we are told the police were called to remove him.

United Airlines gave us this response:

“Flight 3411 from Chicago to Louisville was overbooked. After our team looked for volunteers, one customer refused to leave the aircraft voluntarily and law enforcement was asked to come to the gate.
We apologize for the overbook situation.”

Audra D Bridges, who was on the flight, gave her account of the Sunday flight to the Louisville Courier-Journal. Bridges said passengers were told at the gate the flight was overbooked and United, offering $400 and a hotel stay, was looking for one volunteer to take a Monday afternoon flight to Louisville. Once the flight was filled, Bridges said people on board were told that four people needed to give up their seats to stand-by United employees who needed to be in Louisville on Monday for a flight. She said passengers were told the flight would not take off until the United crew had their seats, and the offer was increased to $800.

Bridges told the Courier-Journal that a manager came onto the plane and said a computer would select four people to be taken off the flight. She said a couple was selected and left the plane before the man in the video was confronted.

Bridges said the man became "very upset" and said he was a doctor who needed to see patients at a hospital in the morning. The manager told him security would be called if he did not leave willingly, and Bridges said the man told the manager he was calling his lawyer. Security officials came onto the plane, and the man was dragged off.

There is no word on the condition of the man removed from the plane.

One passenger said after the incident: " were crying and people are disturbed."