Rescuers in Zhaotong, Yunnan province, continued searching on Sunday for six workers who went missing when water burst suddenly from a barrier lake formed during the magnitude-6.5 earthquake on Aug 3.

The workers were digging tunnels to discharge lake water on Friday afternoon when the water suddenly broke through and flooded the construction site.

The flooding also left another four workers injured, the new office of Zhaotong said on its official micro blog.