A New Zealand paramedic working in Thailand has described the horrific scene he discovered following a deadly bomb blast in central Bangkok.

Marko Cunningham, who works as a volunteer for the Bangkok Free Ambulance service, told media "there were bodies everywhere" when he arrived at the site where the bomb exploded at a popular shrine during evening rush hour Monday (Tuesday NZ time).

"Some were shredded. It was like a meat market. There were legs where heads were supposed to be. It was horrific."

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Deadly bomb blast in central Bangkok

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Mr Cunningham, who is originally from Upper Hutt, told Radio New Zealand's Morning Report he was one of the first to arrive at the site and "was kind of in shock" when he walked into the shrine as he did not know what had happened.

"Somebody said a bomb went off. So then me and 10 other guys started going through the bodies finding out who was alive and who wasn't and then administering first aid to those that... still had pulses, and by that time the ambulances started arriving and we were just triaging them into the ambulances."

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Mr Cunningham, who works as a teacher by day, said there were people still alive under other victims.

"We were just taking bodies off people who were still alive."

The teacher said he was able to resuscitate a woman and she was taken to hospital. He said the response to the blast from emergency services was fast.

The blast had left a two metre wide crater, Mr Cunningham added.

The explosion has killed at least 19 people and left more than 100 injured, officials say.

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Bombs rip through Bangkok

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Video shows aftermath of Bangkok bomb blast

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