SHOCKING footage shows the moment a 164ft bridge collapsed at a construction site in South Korea killing at least four people.

Workers in Anseong, about 45 miles from Seoul, were building a highway bridge over a road when it crumbled.

The five 164ft supports had been put in place by a crane and the deck of the road was being put in place before the bridge collapsed at 9:49 am killing four and injuring six others.

Five of those injured are said to be in a critical condition while the other suffered a minor injury.

The national fire agency’s spokesperson said: “All individuals who suffered injuries are currently being treated at hospitals.”

Dashcam footage from a vehicle on the road below the bridge showed the horror moment in full detail.

The vehicle, just seconds away from being under the bridge was moving away from the construction site when the newly laid connecting pieces instantly plummeted to the ground below.

With the mangled wreckage on the ground in a cloud of dust, all that was left of the bridge were the supports.

Officials later revealed that a group of 10 workers were thrown off either side of the bridge as it fell.

Anseong fire official Ko Kyung-man confirmed that two of the people who died were Chinese nationals and one of the injured was a Chinese citizen.

The other two fatalities were South Korean nationals, officials said.

In a press conference, Ko said: “They were working to install a deck on the bridge.

“All of the 10 were up on the deck … and fell from both sides when it collapsed.”

A major search and rescue operation was launched after the disaster with rescue crews and dogs spotted searching the debris.

Acting President Choi Sang-mok called for the mobilisation of all available personnel and resources to find those who were injured while also ensuring the safety of the site.

Three helicopters and almost 150 officials were deployed for the search and rescue operation, the National Fire Agency said.

And the Transport Ministry sent a team of officials to the construction site.

The bridge was being built to connect the Seoul-Sejong Expressway.

Hyundai Engineering, the head contractor of the site has apologised for the tragedy and is said to be working with officials.

The company said: “We sincerely bow our heads in apology to those who lost their precious lives and were injured in the accident at our construction site.”

“We are actively cooperating with the relevant authorities to ensure a prompt resolution on-site.”

They are also working to identify what caused the shocking collapse.