he footage, from a CCTV camera, shows a man in a yellow shirt leaving a backpack in the Erawan Hindu shrine.
At least 20 people died in Monday's blast, about half of them foreigners, and more than 120 were injured.
In a separate attack on Tuesday, an explosive device was thrown at a pier in Bangkok, but no-one was hurt.
Nationals from China, Hong Kong, the UK, Indonesia, Malaysia and Singapore are among the foreigners killed in the attack.
CCTV footage of a suspect wanted for questioning
Who were the victims?
The facts - what we know so far
The Erawan shrine - popular with locals and tourists
Thai shares fall sharply
Still images of the suspect had already been released.
In the new footage, he is shown carefully and deliberately removing his backpack inside the shrine, getting up without it and immediately leaving the scene.
The spot where he was sitting is precisely where the bomb went off a few minutes later, says the BBC's Jonathan Head in Bangkok.
"There is a suspect... we are looking for this guy," Prime Minister Prayuth Chan-ocha told reporters.
Authorities were "quite close" to identifying the suspect, Thai government spokesman Maj Gen Weerachon Sukhontapatipak told the BBC, but other leads were also being pursued.
He said no motive was being ruled out, but that the bomber did not appear to be Thai and the character of the bombing was "quite different" from previous bombings by southern Thai insurgents.
He said security at transport hubs and tourist sites was being beefed up.
he footage, from a CCTV camera, shows a man in a yellow shirt leaving a backpack in the Erawan Hindu shrine.At least 20 people died in Monday's blast, about half of them foreigners, and more than 120 were injured.In a separate attack on Tuesday, an explosive device was thrown at a pier in Bangkok, but no-one was hurt.Nationals from China, Hong Kong, the UK, Indonesia, Malaysia and Singapore are among the foreigners killed in the attack.CCTV footage of a suspect wanted for questioningWho were the victims?The facts - what we know so farThe Erawan shrine - popular with locals and touristsThai shares fall sharplyStill images of the suspect had already been released.In the new footage, he is shown carefully and deliberately removing his backpack inside the shrine, getting up without it and immediately leaving the scene.The spot where he was sitting is precisely where the bomb went off a few minutes later, says the BBC's Jonathan Head in Bangkok."There is a suspect... we are looking for this guy," Prime Minister Prayuth Chan-ocha told reporters.Authorities were "quite close" to identifying the suspect, Thai government spokesman Maj Gen Weerachon Sukhontapatipak told the BBC, but other leads were also being pursued.He said no motive was being ruled out, but that the bomber did not appear to be Thai and the character of the bombing was "quite different" from previous bombings by southern Thai insurgents.He said security at transport hubs and tourist sites was being beefed up.
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