Police are investigating a fight between two groups of nightclub goers which broke out on Tuesday in the northern city of Hai Phong, with witnesses reporting hearing several gunshots.
Law enforcement said the brawl started around 11:00 pm at a nightclub on Ho Sen Street in the coastal city, located just over 100 kilometers to the southeast of Hanoi.
Around 20 men from two groups at the club got into fighting with knives and a gun, officials said.
A video provided by witnesses shows a man was suddenly attacked by several others while walking on the street.
In an attempt to rush away, he fell and continued to be hit with chairs. He managed to stand up and run only to be hot pursued by the attackers.
A few minutes later other men from the nightclub came to his rescue and the real brawl began, with at least four shots from what police later identified as a rubber bullet gun.
Shortly after the incident, the video went viral on Facebook, with over a thousand comments and reactions.
The fight left one hospitalized with a stab in the thigh.
Disagreement in getting a go-go dancer could have sparked the violence, according to Vietnamese news site VnExpress.