Bangkok bomb live: Video shows moment man slips off rucksack and leaves it at Erawan shrine – minutes before deadly explosive took place

At least 20 people dead in country's "worst-ever" atrocity

Authorities have released images of a man seen near the shrine, shortly before the bomb detonated (Twitter)

Here are the latest updates:

• British national confirmed dead as tributes paid to London law student

• Thai Police on CCTV images: 'He is not just the suspect. He is the bomber.'

• 20 people killed and 123 individuals in hospital

• Video: Is this the moment Bangkok bomber planted explosive?

• CCTV images of suspect released

• Bomb attack wipes 3% off value of Thai stock market

• Thai PM labels attack 'worst ever'

• Bangkok bombing Q&A: Is it safe to travel to Thailand?

• What is the Erawan Shrine?

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An explosion at around 7pm (local time) in the centre of the Thai capital Bangkok that killed at least 20 people has seen authorities scrambling as spectulation mounts over who is responsible.

As many as 20 people have died in the suspected pipe bomb, with 140 injured. The toll is expected to rise in the course of today. One Japanese citizen is reportedly among the seriously injured.

Meanwhile, Thai Prime Minister Prayuth Chan-Ocha told reporters the bombing was "the worst incident that has ever happened in Thailand".

Of the perpetrators he told Reuters: "I have seen the footage, we have some suspects but it is not so clear. We have to find them first."

The country's defence minister said that it was "much clearer" who the bombers were, "but I can't reveal right now," said Prawit Wongsuwan. The minister added that the bombers intentions had been to discredit the government and harm the economy.

Additional reporting by Reuters