At least 10 people are feared dead after a boat carrying around 150 passengers capsized in a river.
Dozens more are thought to still be missing in the Chao Praya River in the southern province of Ayutthaya.
Hundreds are thought to be trapped under the water as divers search for those who are missing.
Video footage posted on Twitter shows the boat half-submerged under the water.
— Thanakarn_BrightTV20 (@Thanakarn_T) September 18, 2016
— RakNongNong;) (@tanawatroemrooj) September 18, 2016
Police have said that those killed were Thai Muslims returning from religious activities.
One of the dead is said to be a child.