A cave-in in an unfinished iron mine killed three construction workers in east China's Anhui Province late Friday, local authorities announced Saturday. The accident occurred at 9:30 p.m. Friday in Lilou Iron Mine run by Anhui Kaifa Mining Co. in Huoqiu County when eight workers were digging the ventilation shaft, Xinhua quoted the county's publicity department as saying in a statement. Five workers escaped to safety, but three buried were found dead at about 8:20 a.m. Saturday, it said. The mine has been shut down in wake of the accident. Local work safety officials are investigating the cause of the accident.