Dallas police released images of a man they called a suspect less than two hours after shooting during a downtown Dallas rally that left four officers dead and several others injured.

But video tweeted by a Dallas Morning News photographer after shots were fired showed the man standing with a crowd of protesters, and his brother immediately declared on a television interview that he wasn't a shooter.

Cory Hughes said that the man in the photos is his brother, Mark Hughes.

He said his brother brought an unloaded rifle to the rally and, when the shooting started, Cory told Mark to hand the gun to a police officer so he wouldn't be mistaken for the shooter, and Mark did.

A video posted by WFAA-TV confirmed that he had handed the gun over.

"Mark Hughes is not the suspect," his brother said. "He was simply exercising his right. He never thought by exercising his right he was gonna be plastered all over the national news as a suspect."

Shantay Johnson said she was recording the march when the person of interest gave her a high-five.

"He just gave me a high-five and smiled and left, that's all," she said. "I didn't see no gun."

Shortly before 11:30 p.m., just half an hour after naming the man as a suspect, police said he had turned himself in — referring to him as a person of interest.

Mark Hughes spoke on KTVT-TV (Channel 11) around 1:40 a.m. and said that he had just left the police station.

Hughes said he had been cleared but that he wanted police to come out and say, "This young man had nothing to do with it."

More on the Dallas Ambush

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Images / video

Graphic video shows ambush, shooting of officers in Dallas

Photos: Terror in downtown Dallas as sniper shootings kill, injure police officers, civilian at rally

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