DENVER - Police are investigating a brutal assault at Summit Music Hall at 19th and Blake streets in Lower Downtown Denver that left a victim in critical condition.
Many police officers responded to the incident Saturday night because the initial reports were that there had been a shooting, said Denver police spokesman Sonny Jackson.
The Kottonmouth Kings were scheduled to play at the concert venue, located at 1902 Blake St., but had not started their performance when the fight broke out.
Denver police said the victim was fighting with another person at the bar, when he was punched, then fell and hit his head. Witnesses told 7NEWS the man could not be revived after he was knocked out.
Other witnesses say it was a chaotic scene inside as officers herded everyone to one part of the bar, as if they tried to figure out who was involved.
There were at least 200 people who were inside and a long line that stretched outside when the assault occurred.
Another witness told 7NEWS that she was in line, ready to go in for the concert when she was told that no one was allowed in because a person had been killed.
However, Denver police said that the victim was not dead, but DPD's homicide investigators were called to the scene, as is the protocol when a victim is in critical condition.
The assault was said to have occurred around 7 p.m. The initial reports amid the chaos was that there had been a shooting but that turned out not to be the case.
By 9:30 p.m. officers had handcuffed about a dozen men in front of the venue and had them do an impromptu lineup where they had to stand under a light and look toward a patrol car, where a witness was apparently sitting.
It's not clear if anyone was taken into police custody.
The victim's name has not been released.
Blake Street was closed between 19th and 20th and the alley between Market and Blake was also cordoned off as part of the investigation. Blake Street reopened by 10:30 p.m.