BEIJING, Jan 31 (Reuter) - Blizzards have killed at least 21 people in China's southwestern Sichuan province while freezing temperatures have caused flooding along the Yellow river, state radio reported on Wednesday.

In Sichuan's Tibetan-populated Shiqu county, at least 21 people were dead, 147 were physically disabled by cold and over 10,000 had suffered frostbite, the broadcast said.

The radio said the figures dated to January 25, indicating further casualties were possible.

The blizzards killed at least 100,000 head of livestock and cut all transport and power in the region, it said.

In north-central Shaanxi province, large blocks of ice on the Yellow River, China's second-biggest, caused it to flood, inundating 10,000 hectares of land and an unspecified number of homes in bitterly cold weather, the broadcast said.

Authorities mobilised the air force to bomb the ice on January 24, a common practice during winter on the Yellow River, the report stated.

China last week reported that blizzards in far western Qinghai province had stranded thousands of herdsmen and killed hundreds of thousands of cattle.