Five people died and around 40 were injured Thursday after a fire broke out at a three-story building under construction in Tama in western Tokyo and smoke engulfed the workers.

Four of the deceased were described Friday as men between the ages of 44 and 52 from Tokyo and Kanagawa Prefecture. The bodies of four of the five were found in the basement. The fifth was discovered on the third floor.

Of the injured, about 30 were in serious condition, according to the Tokyo Fire Department. In all, about 320 workers were at the site.