A bus plowed into more than 30 vehicles waiting at a traffic stop in Seongnam, in the Bundang district of South Korea, during morning rush hour Wednesday, officials said, leaving 57 people injured.

Axar.az reports, citing Korea Times, the city bus, driven by a man in his 60s, struck four other buses, a cargo truck and 27 passenger cars before coming to a stop after hitting a traffic barrier in Seongnam's Bundang Ward at 7:34 a.m.

The bus reportedly hit the vehicles over a distance of about 100 to 150 meters.

The incident left nine people seriously hurt and 48 others with minor injuries. None of the injuries were reported to be life threatening.

The bus driver reportedly told police that the brakes did not work, with investigators looking into the exact cause of the crash.

Police said the driver was not under the influence of alcohol, but plan to check whether he had taken drugs.