Two aftershocks have destroyed about 420,000 houses in the Chinese region hit by an earthquake two weeks ago, the official Xinhua agency says.

One of the aftershocks, in Qingchuan county, measured magnitude 5.7, according to the US Geological Survey.

The official death toll from the earthquake that hit Sichuan province on 12 May is 67,183. Another 20,790 people are listed as missing.

There were no reported deaths from the latest aftershocks, Xinhua said.

‘Quake lake’

On Sunday 300,000 more homes were wrecked in Qingchuan by a strong tremor, which killed eight people and injured hundreds.

More than five million people remain homeless since the 12 May quake.

Meanwhile, 80,000 people were being evacuated from near a lake formed by landslides from the earthquake.

Experts fear the build-up of water at the swollen Tangjiashan lake could burst the banks, deluging the area. Chinese soldiers have dug a channel to ease pressure from the so-called "quake lake".

About 70,000 people have already been moved from nearby Mianyang city in Sichuan province, Xinhua said.