Bungling officials inspected a collapsed road in Bangkok where engineers have been plugging a massive sinkhole with concrete.

Bangkok governor Chadchart Sittipunt checked the progress of repairs to the chasm that opened up at a botched underground train line construction site.

He said more than 1,500 tons of concrete had been poured to seal the sinkhole and prevent further subsidence. The operation was briefly halted to allow the concrete to set before 2,400 more tons were added today.

He said: 'The site remained stable throughout the night. Though there was a slight soil slide of approximately 20 inches (50 centimetres), it did not cause any widespread impact or injuries.'

Chadchart said that officials have cut the electrical cables entangling the Sam Sen Police Station, which is in danger of collapsing. Equipment was installed to measure the building's movement.

Locals were still banned from entering the station building and nearby flats.

The road collapsed on Wednesday morning due to the botched construction of an underground train line and 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.

The Bangkok Governor Chadchart 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.'