The blaze broke out after a freight truck collided with a bus on a highway near Seoul, injuring 37. Hundreds of firefighters managed to bring the blaze under control.
At least five people have been killed and 37 injured in a fire caused by a freight truck colliding with a bus in a highway tunnel near the South Korean capital, Seoul, officials said.
It was not immediately known what caused the collision and the fire on Thursday and what cargo the truck was carrying.
The blaze erupted when the vehicles collided at about 1:50pm (04:50 GMT) in an expressway tunnel in Gwacheon, a fire department official told the AFP news agency.
Fire officials said the collision occurred inside a noise-barrier tunnel on the highway. The raised tunnel is designed to protect surrounding buildings from the noise of the road.
Three of the injured were in serious condition, while 34 suffered light injuries, according to the National Fire Agency.
Enormous plumes of fire and thick smoke were seen coming from the tunnel in images posted on local and social media.