South Korean bus crash injured more than 50

A commuter bus struck more than 30 vehicles during morning

rush hour on Wednesday in South Korea's Seongnam,

injuring dozens of people.

Videos show the bus perched on a median strip with

a shattered windscreen.

Other damanged cars can also be seen.

At least 57 people were treated for injuries, including nine

who were seriously hurt.

Local police are questioning the bus driver, who tested

negative in a breathlyzer test, and told investigators

the brakes failed.