The accident occurred at 9:49 a.m. local time, Yonhap News Agency reported, at a construction site of the Seoul-Sejong Expressway. Several concrete slabs supporting the bridge collapsed after workers used a crane to lift it up and install it on the bridge, causing workers on top to fall. South Korea's acting President Choi Sang-mok has issued an emergency order to mobilize all available personnel and resources for rescue operations, while the National Fire Service has dispatched three helicopters and nearly 150 personnel to search for missing persons.
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