The death toll from a fire that tore through a karaoke bar in southern Vietnam has risen to 23, an official said Wednesday.

The blaze engulfed the second floor of the building on Tuesday night, trapping customers and staff as dense smoke filled the staircase and blocked the emergency exit, reports said.

Many crowded onto a balcony to escape the flames, which grew quickly as they caught the wooden interior, while others were forced to jump from the building, state media added.

Photos showed plumes of smoke billowing out of the bar — located in a crowded residential neighborhood in Thuan An city, north of commercial hub Ho Chi Minh City in Binh Duong province — as firefighters on cranes tried to extinguish the blaze.

"We are still searching for more victims but the death toll so far is 23, and 11 people injured," Mai Hung Dung, a top official with the ruling Communist Party in Binh Duong, told AFP.

Authorities had previously put the death toll at 12.

The initial cause of the fire was said to be an electrical short circuit, state media reported, citing a report by Binh Duong authorities.

Witness Nguyen Sang, who lives near the karaoke bar, told the VnExpress news site that when fire trucks arrived at the scene, a receptionist said there were 40 people stuck inside.

"Many people ran outside through the main entrance, but many others could not stand the heat and they jumped down, breaking their hands and legs," Sang said.

Rescue workers searched through the night for anyone trapped in the 30-room bar, according to state media.

Police said the karaoke facility's fire prevention regulations had been checked prior to the blaze, it added.

In what was previously Vietnam's deadliest fire, 13 people died in a 2018 blaze in an apartment complex in Ho Chi Minh City.

In 2016, a blaze in a karaoke bar in the capital Hanoi left 13 people dead, prompting a country-wide assessment of fire prevention measures at bars and clubs.

Vietnamese Prime Minister Pham Minh Chinh on Wednesday ordered a further inspection of high-risk venues, especially karaoke bars.

Last month, three firefighters died after trying to extinguish a fire at another karaoke bar in Hanoi.