Bedlam broke out at Broadway and Colfax Avenue in downtown Denver about 4:45 p.m. Saturday when witnesses said a 70-year-old man fired two shots point-blank at another man at an RTD bus stop.

Police said the victim was shot in the hand and the suspect was arrested.

Hundreds of people fled the scene, and others took cover on an RTD bus driven by Louie Montoya that had stopped at the corner. Within seconds, police in more than a dozen patrol cars and motorcycles converged on the scene.

Denver police identified the man arrested as Phillip Citro. He was taken to the hospital for treatment of injuries, said a police spokeswoman.

Justin Moore, who was waiting for the bus, said the incident happened right in front of him.

He said the older man bumped into a much younger man, knocking a cellphone out of the younger man’s hand. The younger man told the older man that he should watch where he was going. Moore said the older man seemed disoriented.

Moore said the younger man then walked to a nearby bench. But the older man spun around, reached toward something in the vicinity of his chest and pulled out a handgun. He then fired a shot at the man he had bumped. The younger man immediately jumped up and rushed the shooter. A second shot was fired as they wrestled against the bus. Moore said the two men were grappling over the gun when Moore decided to flee.

Montoya said he heard that the older man had stepped on the younger man’s foot, and that immediately afterward, he heard the young man cuss profusely. He then heard two shots.

For more than an hour, the handgun could be seen on the pavement, just feet from the bus, carefully protected by police officers.