Firefighters were called to the scene just after midnight on Monday, and discovered patrons fleeing through the flame-enveloped front door of the venue. BBC reported.
Footage posted on X shows flames blasting out of the bar as people run out, some screaming, and some falling over. At least two people appear to be on fire.
Prime Minister Anutin Charnvirakul told media at the scene that 27 bodies have been recovered, and others have been taken to hospital. The cause of the fire is still under investigation, he said.
Firefighters were reportedly able to bring the flames under control in about half an hour, but the result was already devastating.
Local reports said that nine men and 18 women make up the 27 who were killed. More than 60 people are being treated in hospital.