Two people were found alive and cut free from the tangled wreckage by rescuers two days after an under-construction building collapsed in coastal Sihanoukville city.

Rescuers try to remove the rubble at the site of a collapsed building in Preah Sihanouk province, Cambodia on June 23, 2019.
Rescuers try to remove the rubble at the site of a collapsed building in Preah Sihanouk province, Cambodia on June 23, 2019. (AP)

Two men were pulled alive from the rubble of a collapsed Cambodian building on Monday, more than two days after a construction site accident that left at least 28 dead.

Hopes that more survivors would be found under the debris had all but faded, but against the odds, two people were cut free from the tangled wreckage and carried out by rescuers.

The seven-storey Chinese-owned building folded in on itself before dawn on Saturday as scores of workers slept within the under-construction building in Sihanoukville.

A grim-faced Cambodian Prime Minister Hun Sen visited the scene of the collapse in Sihanoukville before daybreak on Monday.

He watched the rescue of the two survivors, climbing into their ambulances to see them before they were taken to hospital.

Regional governor resigns

The prime minister has ordered inspections of all building sites in the beach town, which is undergoing a Chinese-bankrolled development boom. Condos and hotels are springing up to cash in on the surge in Chinese visitors to its dozens of casinos.

The governor of Preah Sihanouk province, meanwhile, resigned on Monday.

Yun Min accepted he had made a managerial "mistake," according to a post on Hun Sen's Facebook page.

Three Chinese nationals and a Cambodian landowner have been held for questioning over the building collapse.

Residents near the disaster scene said they had long feared tragedy was imminent.

"These buildings are coming up in just a year," said Sock Dara, 45.

"We have been concerned for a long time about the quality of these Chinese buildings."

Authorities on Monday put the death toll at 25 shortly before an AFP reporter witnessed rescuers pulling out three more bodies from the debris, bringing the total to 28.

Billion dollar town

Distraught relatives at a local hospital said around a dozen people were believed to still be entombed in the concertinaed floors.

"I lost my husband and my nephew," said Khim Pov, 47, crying and hugging her daughter as her son – who was able to crawl from the debris – received treatment.

"I don't have any hope my husband has survived. The bodies being pulled out have been flattened," she said.

The once-quiet fishing village of Sihanoukville has seen a remarkable Chinese construction boom driven by the need for rooms for tourists flocking from the mainland to its dozens of casinos.

The Chinese embassy in Cambodia, a strategically important ally to Beijing with ports and borders to other Mekong countries, expressed their condolences and backed a "thorough investigation" of the role of the three Chinese nationals and the cause of the accident.

There are an estimated 200,000 construction workers in Cambodia, most unskilled, reliant on day wages and not protected by union rules, according to the International Labour Organization (ILO).

There are also thousands of Chinese workers employed on Beijing-funded projects, fuelling tension with local labourers who envy their better pay and conditions.  

Beijing is pouring investment into Cambodia as part of its behemoth Belt and Road initiative, a sweeping trillion-dollar infrastructure programme across Asia, Africa and Europe. 

Around $1 billion was invested in the Preah Sihanouk province between 2016 and 2018 alone, and there are around 50 Chinese-owned casinos and dozens of hotel complexes under construction in Sihanoukville. 

Source: AFP