Bangkok, Aug 18 (IANS): The image of a man believed to be the prime suspect behind the deadly bomb blast in Thailand's capital city of Bangkok was captured by closed circuit cameras before the explosion which killed 20 people and injured 125 other, police said on Tuesday.

National police chief Somyot Pumpunmuang said on Tuesday that the image of the man in a yellow T-shirt was captured by closed circuit cameras at the Erawan Shrine before the explosion, The Bangkok Post reported.

On Monday evening, an improvised explosive device (IED) went off near the Brahma statue at the Erawan Shrine at the Ratchaprasong intersection in central Bangkok, packed with evening rush-hour commuters and tourists, many of whom were visiting the shrine.

The suspect is seen sitting on a bench inside the shrine compound with a backpack, and then placing the bag under the bench before leaving. He then caught a taxi motorcycle at nearby Soi Mahatlek Luang road.

However, the police chief did not disclose any details regarding the suspect's nationality.

Police were now reviewing all surveillance camera footage from the Ratchaprasong area recorded over the last two weeks, he said.

An arrest warrant could be obtained for the suspect by showing the camera footage to the Criminal Court as evidence, Somyot added.