At least 57 people were injured when a commuter bus crashed into 32 vehicles stopped at a traffic signal during Wednesday's morning rush hour in Seongnam, south of Seoul, South Korean fire officials said.
Of the injured, nine sustained serious injuries and were receiving treatment, but none was in life-threatening condition, according to the Gyeonggi Province Fire Department, which oversees the area.
The bus hit the 32 vehicles before crashing into a median strip, fire officials said.
Photographs from the accident site showed the bus resting on the median strip with its windshield shattered and several other vehicles damaged.
Police were questioning the bus driver, who tested negative in a breathalyser test and told investigators that the vehicle's brakes had failed, said Park Chang-gon, an official at the Bundang district police station in Seongnam.