At around 8:50 am today (23rd) at the construction site of the new construction site for Gasan Metro Knowledge Industry Center in Gasan-dong, Geumcheon-gu, Seoul, gas, a chemical used for extinguishing fire, leaked, and 9 workers fell and 4 of them were in cardiac arrest.

Fire officials believe there may be additional injuries in the building and are conducting rescue operations at the scene.