This footage, posted to Twitter, shows smoke and flames pouring from a window in the building in the Sonezakishinchi area of Kita Ward.
NHK said 27 people suffered cardiopulmonary arrest, 24 of whom died. A 28th person was injured. Police were investigating possible arson.
It is believed the fire broke out at a clinic on the 4th floor of the eight-story building, the outlet said. Credit: @pantyripo via Storyful