The fire broke out on the fourth floor of a multi-tenant building early Friday. Witnesses said that the suspect brought an inflammable liquid in a paper bag and ignited it. As many as 28 people sustained injuries in the blaze including the arsonist.
Early on Sunday, investigators arrived at the building to watch the security footage, which showed that right after the fire began, the 61-year old stood in front of the exit spreading his arms to the sides to keep people from leaving the building, according to the media.
The ignition started in the central part of the building, near the entrance, and the fire blocked the way to the elevator and the stairs that were the only way to escape the blaze, NHK said. People were trying to hide from the fire inside the building and were asphyxiated by the carbon monoxide gas that blocks access of oxygen.