The bus, which was stationary at the time on a busy road, was buried under the rubble in Gwangju, some 270 kilometers (168 miles) southwest of the capital, Seoul.
A further eight people were injured, the ministry added.
The 16 demolition workers on the site are safe and did not sustain any injuries as the building collapsed.
Approximately 190 firefighters were deployed for search and rescue, and police joined the rescue effort, the ministry said.
The reason for the collapse was unclear, Reuters reported, citing officials at the Gwangju Fire and Safety Headquarters. The Ministry of Land,…
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