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74 days after the launch of the special version of the Itaewon disaster, the results of the investigation were announced.

Based on scientific analysis, etc., it was even proven that there was a crowd fluidization phenomenon before the disaster, but it seems inevitable that the investigation on the top line was insufficient.



This is Reporter Sohn Ki-jun.



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The Special Investigation Headquarters, which analyzed the site of the disaster from various angles, revealed that a "crowd fluidization phenomenon" had occurred before the disaster.



On the same day, from 5:00 pm to 10:00 pm, nearly 52,000 people got off at Itaewon Station, but the width of the alley in question was around 4m, and the narrowest section was only about 3.2m.



Here, the slope of the alley was measured up to 11 degrees.



Because of this, the crowd density in the alley at the time of the disaster exceeded 10 people per square meter.



[Son Je-han / Head of Special Investigation Headquarters, National Police Agency: (On the day of the accident), 'crowd fluidization' began to occur around 21:00, and after that, while congestion and loosening were repeated, at around 22:15, many people were pushed down the alley of the accident...

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Experimental results were also announced that the risk of crushing would have been less if the flow of people in the alley was only one-way or two-way right-hand traffic.



[Park Joon-young / Professor of Mechanical Design Engineering at Kumoh Institute of Technology: As for what happens when (flow) is changed to one-way, it is the same environment, but even if there are 300, 500, 600, 800, and 1,000 people (with the flow) ) It was confirmed that clogging did not occur.]



Through a 74-day investigation, six people, including former Yongsan Police Station chief Lee Im-jae and Yongsan-gu chief Park Hee-young, were arrested and sent. I'm going to evaluate



The special version terminated the investigation of Minister of Public Administration and Security Lee Sang-min, Seoul Mayor Oh Se-hoon, and National Police Agency Commissioner Yoon Hee-geun with no charges on the grounds that the Disaster and Safety Act does not have a specific duty to pay attention to crowd gatherings in certain areas.