<Anchor>
There are many stories about the cause of the disaster.
There are many sayings such as 'someone pushed at first' or 'a crowd gathered to see a celebrity', but there are no exact facts yet.
However, the police are also checking the facts, such as intensive analysis of CCTV, as these allegations are emerging.
By Park Ha-jeong, staff reporter.
<Reporter>
This is an alleyway video filmed before the accident.
In an alley full of people, but with some traffic, suddenly people stumble greatly.
It looks like something has been pushed.
Survivors and eyewitnesses claim that a few men in certain costumes, or even some foreign men, actually pushed people by saying "Let's push".
When asked whether these allegations were being raised, the police responded, "We are looking broadly."
52 CCTVs installed in 42 nearby locations were obtained and videos uploaded to social media were also intensively analyzed.
So far, the police have investigated a total of 44 people, including store employees and injured people, and it has been confirmed that they stated that they heard some shouting "push".
Yesterday, the police and the National Forensic Service conducted a joint investigation of the accident site for two hours.
To analyze the density and risk at the time of the accident, a 3D scanner was used to accurately photograph and measure the scene.
I also looked around the entrance of a store in the alleyway that went down to the second basement level.
In the investigation of witnesses and injured persons, it was confirmed that there was a statement that a woman fell in front of this store, and it was too noisy even when people shouted not to push, so she kept pushing and falling from behind.
Police said the time when it was confirmed that the alley was full of people walking in both directions was 10:11 p.m. on the day of the accident, and it was 10:17 p.m. when a crowd was pushed into a nearby store and fell.