NANNING, Feb. 4 -- A bus fell off a more than 50-meters-high cliff and injured 15 passengers on Tuesday in south China's Guangxi Zhuang Autonomous Region, local authorities said.

The accident took place at around 8:00 a.m.in Dahua Yao Autonomous County. Four people were severely injured while another 11 suffered slight injuries, according to the local public security bureau.

Rescue work is underway.