SEOUL, South Korea — A blaze at a construction site southeast of Seoul killed 38 people on Wednesday in one of the deadliest fires to hit South Korea in recent years, police officers and local news reports said.

With emergency workers still looking for one other person who may remain trapped inside a building filled with toxic smoke, they have so far found 38 bodies, Seo Seung-hyeon, a local fire department chief, said during a news briefing. Ten others were injured, including eight who were in serious condition, he said.

When the fire broke out, 78 workers were believed to be working in the four-story warehouse under construction in Icheon, 50 miles southeast of Seoul, the Fire Department said.