Houston Police say they do not know why a 21-year-old Houston man walked into downtown Monday night and started firing a 40 caliber assault rifle.

The man walked into Tranquility Park at about 5:15 p.m. Witnesses said he was wearing a black business suit and started shooting.

"Right when I heard those initial three shots, I ran for cover. I heard another at least dozen shots," Joe Roche, a witness, said.

The man fired shots near the Occupy Houston campsite, but police do not believe the shooting had anything to do with the protests.

"He got to the bridge and he started firing in the air and then fired more shots into the water to let people know, this is a real gun, I suppose," Robert Andrews, another witness said.

Witnesses said the shooter claimed he was the "White Knight," talked about police corruption and fired away.

Police quickly arrested the man. A police spokesman said two officers on bicycles fired several shots, hitting the man, after he got within 25 feet of them.

"They see him fire a shot into the water. They give him verbal commands throughout. And he's refusing any of the commands. Instead he puts the gun up to his head at one point and starts waving the gun again at the officers," HPD Spokesman John Cannon said.

Police said about 10 shell casings were found on a bridge. Police divers searched for more shells under the water.

The shooter was rushed to Ben Taub Hospital with non-life threatening injuries. He was expected to undergo surgery.

The Harris County District Attorney's Office will determine what charges are filed.
The suspect's name has not been released.

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