The death toll from a devastating earthquake in China reached 600 and about 2,400 poepl wer injured as rescuers reached deeper into the most heavily damaged areas in arelatively populated rural area of southwestern China's Yunnan province.Landslides have created barrier lakes where water levels were rising to pose a new threat to about 800 villagers.Several roads have been blocked and there are fears about floods as debris blocks rivers.Rising lakes formed by landslides, complicating relief efforts following a powerful 6.5 magnitude earthquake .A huge quake lake containing more than 3,000 cubic metres of water has inundated dozens of homes and continues to threaten nearby villages, said local hydrological officials.