Thai Prime Minister Anutin Charnvirakul has ordered an investigation into the major collapse of a road in Bangkok

The cannabis campaigner, installed as an interim leader following a series of scandals, today visited the giant sinkhole that was caused by a botched underground train line construction site on September 24.

Footage shows the carnage after massive chunks of pavement, electric posts, and cars were dragged into the chasm in central Bangkok, where government offices and royal residences were concentrated.

The PM vowed to have the 50m-deep sinkhole fixed without delay.

He said: 'As Prime Minister, I must apologise to all citizens. This is not the time to place blame as the road restoration must be prioritised.'

He cited the volume of collapsed soil, tunnel repairs, securing electrical cables, and protecting nearby buildings as the biggest challenges. Repairs were also hampered by ongoing rain.

The road collapsed on Wednesday morning due to the shoddy construction of an underground train line that caved in and caused a burst water pipe.

Miraculously, nobody is believed to have been injured. However, officials said 'two or three' police vehicles had been lost in the sinkhole.

Bangkok Governor Chadchart Sittipunt arrived at the scene at 8 am to assess the situation. He said recent construction from an underground train for the city's MRT purple line may have contributed to the collapse.

He said: 'Once the road was damaged, debris from the surface poured into the underground construction void, causing the area nearby to fall inside.

'A water pipe was damaged, causing a leak, which contributed to the issue. Nobody was injured, but damage to nearby buildings, including a new police station, is being assessed.'

Prime Minister of Thailand and cannabis campaigner Anutin Charnvirakul later arrived.

Police Lieutenant General Sayam Boonsom, commissioner of the Metropolitan Police Bureau, said the area was undergoing roadworks at the time of the collapse.

Officers said a damaged water pipe could have further caused the earth to weaken.

The police chief said: 'A preliminary assessment has found that construction activity may have caused the ground to sink and form a cavity underneath. The ground continued to subside.

'The area is being secured and investigations are ongoing into the cause, with several organisations working to assess the damage and the structural safety of the road.'