From https://www.dailynews.co.th/news/1241060/
10:00 AM, fire broke out at the coffee shop in Jomtien Resort Hotel. A worker was removing LPG hose from a stove that was used for breakfast serving. The valve was not fully closed. After a while, someone smell the gas and walked back to check. Instead of closing valve, he mistakenly opened it. Large amount of gas leak out and ignited by the flame on the stoves nearby. Flash fire, following with explosion began. Workers tried to put the fire out but fail. Fire spreading to second floor, third floor rapidly.