The death toll from the collapse of a highway tunnel under construction in southwest China's Yunnan Province on Tuesday rose to six, local authorities said.  

Six people were killed and another six remain missing. This is the latest information as of 2:00 p.m. local time on Wednesday as search and rescue operations continue.

The accident occurred at about 6:00 p.m. Tuesday local time at the tunnel exit on a highway in Fengqing County, Lincang City, the county information office said.

Investigation into the incident is underway.  

(CGTN reporter Meng Qingsheng contributed to the story)