The accident occurred at around 2:30 p.m. on the overpass in Seosomun, western Seoul, which has been gradually removed since last August and is scheduled to be fully demolished by early next month.
At least two were dead, several were injured, and rescuers are still searching for others who may be trapped under the rubble.
Fire authorities immediately deployed over 60 firefighters, a dozen vehicles, and five ambulances to the scene, accompanied by around 30 police officers.
Train service between Seoul Station nearby and Sinchon Station has been suspended due to the collapse, with other services also affected.
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