More than 200 relief workers in quake-hit southwestern China have been buried by mudflows in recent days.
Details of the accidents are not immediately available and it remains unclear whether any of those buried have been pulled out alive.
News of the mudflows came seven days after a 7.9-magnitude quake hit Sichuan province.
There have been numerous rockslides from unstable mountains and blocked rivers swollen by heavy rain have threatened to burst their banks.
Meanwhile, China has started three days of national mourning for more than 30,000 victims of the earthquake.
Public entertainment has been suspended, flags have been flown at half-mast and a three-minute silence has been observed to mark exactly a week since the quake.
The national flag in Tiananmen Square in central Beijing flew at half mast after a ceremony at dawn.
The Olympic torch relay, currently on its domestic leg ahead of the 8 August opening in Beijing, was also suspended for three days.
Around the country, air raid sirens and car, train and ship horns sounded to 'wail in grief' at 7.28am, the time the quake hit a week ago.
The Shanghai and Shenzhen stock exchanges and the futures exchanges in Shanghai, Zhengzhou and Dalian also halted trading for three minutes.
Survivors pulled from rubble
In the city of Beichuan in Sichuan province, hard hit by the earthquake, relatives continue to travel back into the disaster zone to look for family members and see the damage for themselves.
The official death toll stands at nearly 32,500. Some 220,000 people are reported injured and a further 9,500 are thought to be still buried under the rubble across Sichuan.
Most are feared dead, but some are still being pulled out alive.
Rescuers saved at least two women this morning in a house near a coal mine, Xinhua said.
Officials have tried to keep people from the area because of aftershocks and a build-up of water in blocked rivers.
Xinhua said the most dangerous mass of water was only about 3km upstream from Beichuan town where rescue workers saved a man yesterday from under the remains of a hospital.
China says it expects the final death toll to exceed 50,000. About 4.8m people have lost their homes.
