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A seven-story building under construction collapsed in Cambodia's coastal city of Sihanoukville early Saturday, killing seven workers and injuring 21, authorities said. Provincial authorities said in a statement that four Chinese nationals involved in the construction have been detained while an investigation into the collapse is conducted. Rescue work at the site was underway to determine if any more workers were trapped in the rubble, said the city police chief, Maj. Thul Phorsda. Rescuers could be seen using saws to cut steel beams and excavators were removing piles of rubble from the site.