Engineers dumped concrete into a massive sinkhole that opened up on a road in Bangkok.

Cement trucks were dispatched today to pour concrete into the gaping chasm at the botched underground train line construction.

Bungling officials had earlier planned to clear the abyss using a crane, but abandoned the operation after metal shafts caught against debris.

They later reinforced the sinkhole with sandbags and concrete to protect nearby buildings and prevent further subsidence.

Bangkok Governor Chadchart Sittipunt explained that the collapse was caused by a large amount of soil flowing into the subway construction tunnel, which was near a hospital and a police station. The pressure caused a water pipe to burst, which furthered weakened the earth before the collapse.

Officials said the nearby Vajira Hospital was relatively secure because of its underground concrete walls. However, a new five-storey police station in the area was in danger of collapsing after its foundation was eroded.

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.'