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Rescue personnel work Saturday at the site where an building under construction collapsed on Friday, trapping and killing workers, in southern Cambodia's coastal Kep province.

TANG CHHIN SOTHY/AFP/Getty Images

At least 10 people were killed and 23 injured after a building in Cambodia collapsed, trapping workers under rubble, officials said on Saturday.

The seven-storey concrete building collapsed on Friday in the coastal town of Kep, about 160 km (100 miles) southwest of the capital Phnom Penh.

It came a year after another construction site collapsed, killing 28 people in Preah Sihanouk province.

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“There are five dead that we have already pulled out and there are other five people dead that we saw and we haven’t been able to pull out from the collapsed building yet,” Kep governor Ken Satha told Reuters.

An unknown number of workers remained trapped, Satha said, adding that authorities had detained a Cambodian couple, the owners of the building, for questioning.

The couple had intended to build a guesthouse, Satha said.

Prime Minister Hun Sen said on Saturday that rescuers were still struggling to reach those missing in the rubble.

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“As of the 4th this morning, emergency crews are still working on the removal of the concrete slab, cutting through iron fittings to continue to find more people,” Hun Sen said on his Facebook page on Saturday.

Cambodia is undergoing a construction boom to serve growing crowds of Chinese tourists and investors.