A landslide has killed one worker and left two missing near China's Three Gorges dam,

The cause of the accident was not known,

it comes amid growing warnings the dam is threatening its surrounding environment

Experts have warned of an increased risk of landslides around the dam

The Three Gorges dam is the world's largest hydro-electric project

The area had suffered from heavy rain in recent days

the area had seen more tremors and landslides as water levels in the reservoir rose and put pressure on surrounding slopes.

four million people were to be moved from the area around the dam amid warnings of an "environmental catastrophe

Problems included an increased risk of landslides caused by erosion on the steep hills around the reservoir and increasingly polluted water supplies

the committee said that there was "a long way to go" to solve the environmental issues posed by the dam.