Startling surveillance footage shows a suspect dancing in the street after allegedly knocking out an 83-year-old man.

Tuyen Nguyen was walking to get his morning coffee and newspaper in Santa Ana, California at 6.10am on Friday when he was suddenly attacked, police said.

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Video shows the assailant punching Nguyen across the face, knocking him over and scattering his belongings across the ground. The man then appears to dance beside him.

Police said the attack was without provocation.

Nguyen was taken to hospital, where he was treated for a brain hemorrhage and broken facial bones, relatives told KTLA.

"He's in a lot of pain right now, physically," his daughter Julie told the channel. "And for us it's a mental anguish, mental pain. It's a lot."

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After police appealed for help tracking down the attacker, 29-year-old Demarrea Chante Barnes was arrested in Anaheim. He is pictured in a mug shot provided by the Santa Ana Police Department.

Barnes, who police believe is a transient, was booked on assault with a deadly weapon other than a firearm and assault with a deadly weapon with great bodily injury, the Santa Ana Police Department said.

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