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It was confirmed that the flammable material used in the arson was gasoline.
In addition, a knife was also found at the scene, and two of the dead victims had stab wounds, so an investigation into this area is ongoing.
Reporter Park Ye-rin reports.
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This is the hallway on the second floor of the building where the fire started.
The floor and walls were burnt black, the windows were smashed and shards of glass were scattered on the floor.
[The occupant of the building: The soot has completely settled down.
It still smells bad, and the broken glass after that is also dispersed...
I can only breathe.]
On the morning of the 10th, the second joint investigation was held with the participation of the police, the National Forensic Service and the fire department, and the flammable substances used in the fire were confirmed to be gasoline components.
Three glass containers and a white cloth, believed to have been used for fire prevention, were also recovered from the office.
A 53-year-old arson suspect was found dead in front of a separate door used by lawyers inside the office on the second floor, a police official said.
A weapon with a blade length of 11 cm was also found inside the office.
Police are investigating whether the weapon is related to the wounds on the body of the lawyer and secretary who died at the scene.
In addition, an autopsy is being carried out to confirm the exact cause of death of the seven people who died in the arson.
Meanwhile, at the time of the arson, one lawyer and six employees were working in the office, and it is known that one employee broke a window and escaped and survived.
Police said they called the survivor and conducted a witness investigation, but said that the interior was filled with smoke and that he had not properly witnessed the moment of the accident.
The police plan to investigate the exact ignition point and planned crime method, taking into account the fact that the gasoline ran from the hallway to the inside of Office 203.
(Video coverage: Kim Se-kyung, Video editing: Park Chun-bae )
▶ Scorched and collapsing…
Lawyer's office for 'arson', the scene was horrendous