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police and the fire department went on to work together to identify exactly where and how the fire came from. Until now, oil vapor on the second basement level, so tiny droplets of oil spread out like mist in the air, for some reason it is presumed to have sparked there and led to an explosion.

Reporter Jeong Ban-seok toured the fire scene with an expert.

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joint sensation group observed that the first and second floors of the warehouse were visually observed for six hours, and the fire seemed to have started from the second floor.

[Jeongyoseop / game Southern Police forensic colon: is estimated georo ignited in the second basement when viewing the sohwe forms, etc. Today he concentrates on excavation faces the second basement floor in a state excavation has not yet completely finished -

yet accurate fire In order to find out the cause, we decided to conduct precise identification from the 2nd basement floor where debris is accumulated.

I toured the site with experts.

This is the fire site of the Icheon Logistics Warehouse filled with black soot.

The outer wall has been burned down and the steel frame is also curved.

[Lee Yong-Jae / Professor, Department of Fire Safety Management, Kyungmin University: Looking at the reinforced concrete pillars, there was a peeling phenomenon where the surface was thinly separated. It's a very typical phenomenon that occurs when a high temperature of 1,000 degrees or more is suddenly applied.] With

the cooperation of the fire department, an expert who looked closely at the site judged that the damage at the back of the building close to where the cargo elevator was located at the time of the accident was the greatest.

[Lee Yong-jae / Professor, Department of Fire and Safety Management, Kyungmin University: A freight elevator is installed on the left side. What kind of welding work was there?]

There were many possibilities for the ignition source that caused the first explosion.

[Lee Yong-Jae / Professor, Department of Fire and Safety Management, Kyungmin University: The probability of sparks is most likely to be welding or melting (cutting metal). Because it is under construction, there are a lot of wires that are connected and used. There's a lot of chance that sparks popped up there. If a worker has smoked or has done such an inappropriate act.] The

Joint Sensation Group will conduct a second precision inspection tomorrow (1st) in the morning.

(Video coverage: Taehoon Kim, Video editing: Moo-Hwan Jo)

▶ 'Fire risk' six times warning… 'Conditional'