June 02, 2016 11:30
A subway construction site in Gyeonggi Province collapsed on Wednesday, killing four workers and injuring at least 10 others.
Police say the number of casualties could increase as some of the injured are in critical condition.
The site in Namyangju was rocked by an explosion at 7:20 a.m., with one witness saying the blast was so powerful it shook buildings nearby.
Seventeen workers were doing welding work on the site when the blast occurred.
Those buried under the debris were rescued and immediately taken to nearby hospitals.
Police believe an oxygen cylinder at the site exploded, but an investigation of the exact cause is underway.
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