New video reveals moments before passenger was dragged off United flight

Surveillance video shows David Dao and his wife boarding the United flight. Also, a newly released police report claims an officer lost hold of a flailing Dao while officers tried to remove him from the plane.
1:43 | 04/25/17

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Transcript for New video reveals moments before passenger was dragged off United flight
Now to new video and details from police about what they say happened before and after the tense confrontation with the doctor on a united Ailes flight. David Kerley has the latest. Good morning. Reporter: Good morning, Michael. Officers thought they were dealing with an overbook situation. Not that unite was trying to make room for a crew. They say the passenger, Dr. David Dao was acting belidge represently. Check out the new pictures. An apparent bloodied officer, another result of the united clash. That same surveillance camera showing Dr. Dao and his wife earlier boarding. His wife, running off and running back on. Was she checking to see if they could take united's offer to be bumped? Soon, police were called. The airline overbooked the flight. They need two passengers to get off. Reporter: A new report says an officer lost a hold of Dr. David Dao. He lost teeth, cuts, and more, requiring surgery. An ambulance is called to the jet. He's clinging to the party of the galley. Later, we see the officer with bruises or blood stains. And the airline crew the doctor was told the give up his seat for. His attorney said a lawsuit remains very possible. It escalated in his case to physical harm. Unnecessarily. When he was lawfully where he was entitled to be. Reporter: Now, the the attorney also told us those claims by the officers that his client, the the passenger, Dr. Dao was acting belligerently, the attorney called it nonsense. He said consider the source. This story is far from over. Thank you, David.

This transcript has been automatically generated and may not be 100% accurate.

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