A Chinese construction company is facing questions over the deadly collapse of a Bangkok skyscraper -- the only major building in the capital to fall in a catastrophic earthquake that has killed more than 2,000 people in Thailand and neighbouring Myanmar.

The 30-storey tower, still under construction, was to house government offices, but the shaking reduced the structure to a pile of rubble in seconds, killing at least 13 people and injuring nine.

It was the deadliest single incident in Thailand after Friday's 7.7-magnitude quake, with the majority of the kingdom's 20 fatalities thought to be workers on the building site and hopes fading for around 70 still trapped.

Sprawling Bangkok bristles with countless high-rise blocks, but none have reported major damage, prompting many to ask why the block under construction gave way.

"We have to investigate where the mistake happened," said Thai Prime Minister Paetongtarn Shinawatra, who has ordered a probe into the materials and safety standards at the construction site.

"What happened from the beginning since it was designed? How was this design approved? This was not the first building in the country," she told reporters on Saturday.

The development near Bangkok's popular Chatuchak market was a........

© International Business Times