Deadly Police Ambush in Baton Rouge

Law enforcement officials say 29-year-old went hunting for cops at a police station.
2:52 | 07/18/16

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Transcript for Deadly Police Ambush in Baton Rouge
New and difficult images of the moments three officers were shot and killed in baton groups this surveillance image of the gun masked heavily armed stalking the officers. This video recorded by a woman caught in the cross fire inside her car the gunman aiming only at those officers. And these images tonight the faces of the three who died one of them losing his life while running back into danger trying to save a fellow officer. ABC's stable since army is in Baton Rouge tonight. A Louisiana law enforcement officials are mixing works tonight calling this an ambush saying that 29 year old Gavin long seen here in surveillance video went hunting for cops. There's no doubt what so ever. That these officers were intentionally targeted. And assassinated. They say the screen grab show how the deranged gunman snuck up on police officer Sunday morning three dead one injured dislocation. As the first calls to 911 were coming in. And yet I'm granite and yet. Police say he was already shooting and wounding a city police officer and then killing sheriff's deputy Brad Gareth cola who ran to help. Police say he then turned around and executed the wounded officer. Out. In the end they took law now with gunfire from the swat team firing more than a hundred yards away and through a structure. Char main Adams had just left working the night shift at Waffle House. She got caught in the cross fire started reporting on her cellphone. And it kind of blatant form when it to hit the he was supposed to Wear thick clumps. Five police officers were wounded one still fighting force like tonight. Killed were gay or a full look Matthew Gerald and Montreal Jackson who's the same color as the shooter. In a powerful FaceBook post last week defended his badge to friends saying I love this city but I wonder if this city loves me. Sandra sterling has the woman who raised 37 year old Alton sterling who died at the hands of police she says she still fighting for justice. But says killing cops is wrong on every level. This world. Apply when the neckline. Impersonator practice. Back to me that today one without. And Steve Olson Sami joins us from Baton Rouge tonight and Steve as you pointed out there authorities revealed today that one of those officers who was killed. Had run back in to save a fellow officer. Yes David police are calling that sheriff's deputy who also died. I heroes saying that he was trying to save an officer who was falling away from the gunfire. That it must be said that what's happening here doesn't help the dialogue one bit. Between policing uniform and protesters in the streets David a question about that Steve Lewis and Sami leading to solve Steve thank you.

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

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