Investigators with the Casper Police Department are hoping to speak with anyone who witnessed a fight at the Gaslight Social in which a man was severely beaten after possibly pulling a knife.

Alvaro Proa, 21, was flown to a Denver hospital following the fight. Witnesses told police that Proa and three others were being escorted out of the bar, when Proa allegedly picked a fight with a bouncer.

Court documents say Proa admitted that he had a knife on his person at the time of the fight, but denied brandishing it. A knife was given to investigating officers by bar staff.

Video footage of the incident shows an unidentified woman, who is pictured above,  using her cell phone to record the fight, police say in a Facebook post. Investigators believe she and others at the bar shortly before 1 a.m. on Oct. 29 may have witnessed the fight, which occurred during the Gaslight Social's halloween party.

Detectives hope to obtain copies of any video footage of the event captured by people who were at the bar that night.

Anyone with information on the incident is asked to contact Detective Stedellie at 235-8371. Callers should reference police report number 17-067465.