A subway tunnel under construction near Seoul collapsed on Friday, likely leaving two workers trapped at the site, officials said.
The National Fire Agency said in a statement that authorities were mobilising 55 rescue workers and 18 vehicles to rescue possible victims.
The collapse happened at Gwangmyeong, a city just south of Seoul.
Gwangmyeong city officials said authorities earlier withdrew workers from the construction site and stopped traffic around the area after receiving reports that a ventilation shaft at the site was at a risk of collapse.
The officials said it wasn’t immediately known whether any workers re-entered the site.
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