At least 49 people were injured in a night fire in a 33-story skyscraper in the South Korean city of Ulsan.
As the national news agency Yonhap reported, citing rescue workers, most of those affected had inhaled smoke.
Images from South Korean television showed on Friday night (local time) how a whole side of the building was on fire.
It was initially unclear whether the fire in the metropolis in the southeast of the country resulted in deaths.
Residents apparently fled to the roof
According to Yonhap, the fire was largely brought under control after a few hours, but the situation in the commercial and residential building was still confusing at around two in the morning.
About 50 people had fled to the upper part or to the roof of the building to save themselves.
According to the US broadcaster ABC, people were also taken from there.
The fire broke out at around 11 p.m. on Thursday between the eighth and twelfth floors and then spread quickly upwards, it said.
High winds reportedly fanned it.
Videos that circulated on the short message service Twitter could be seen as burning parts fell from the house.
It was unclear whether there was an acute risk of collapse due to the fire.
According to the BBC, around 120 households live in the building and there are also shops.
How many people were in the building at the time of the accident was initially not known.
Icon: The mirror
fek / dpa