A MAN has been shown on security footage walking into a packed religious shrine and placing a bomb-laden backpack before a blast that killed at least 20 people.
Monday's attack in one of the Thai capital's most popular tourism hubs ripped through a crowd of worshippers at the Hindu shrine close to five-star hotels and upscale shopping malls.
At least 11 of the victims were foreigners from China, Hong Kong, Singapore, Indonesia and Malaysia, but no Australians were reportedly among the dead.
More than 100 other people were injured as the blast left body parts, shattered glass and incinerated motorcycles strewn across the crushed concrete of a busy intersection.
Junta chief Prayut Chan-O-Cha said the bombing was the "worst ever attack" on Thailand and that the hunt was on for the bomber filmed on closed-circuit television at the shrine.
The junta chief added that the suspect was believed to be from an "anti-government group based in Thailand's north-east" - the heartland of the kingdom's anti-coup Red Shirt movement.