A man whose vicious beating by multiple suspects on the 16th Street Mall was captured on camera disappeared before police arrived and has not been located.

Police who investigated the beating at 10:56 p.m. Wednesday at 16th and Stout streets have also been unable to identify the suspects, said John White, a Denver police spokesman.

On video captured by a resident from his fourth-story apartment in the area, a man could be seen running across the median of the mall before being tackled and beaten by multiple people. The man was sucker-punched twice after he was knocked to the pavement immobile.

Police responded to the call, but by the time they arrived there wasn’t any large group of people around, White said.

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It’s unclear what provoked the violence without witnesses, White added.

“This kind of incident could happen anywhere in the city,” he said.

The attack was one of a series of assaults on the mall that have happened this summer.

On June 29, a man struck several people with a plastic, PVC pipe at the corner of 16th and Cleveland Place. The assaults by Clarence Seeley of Indiana was captured on video. One victim suffered a head laceration but did not seek treatment.

Denver Mayor Michael Hancock subsequently blamed marijuana for an increase in “urban travelers” to the area, calling them a “scourge of hoodlums.” He previously said there were about 150 urban travelers hanging out at Commons and Confluence parks.

Police Chief Robert White urged downtown pot shops to stop selling single joints as one way to reduce violence. The Downtown Denver Partnership also has been beefing up security, including hiring new private security guards. Denver police have increased foot patrols as well.

Spokesman John White said Friday that it would be difficult to attribute what happened in the latest incident to urban travelers or anyone else because no one involved in the attack has come forward.