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Authorities across the US are on alert as a winter storm brings freezing winds, ice and snow to many areas that rarely see such frigid conditions.
President Joe Biden has approved a state of emergency in Texas where a surge in demand for electricity has led to widespread power cuts.
The National Weather Service (NWS) said more than 150 million Americans were now under winter storm warnings.
Kentucky, Mississippi, Alabama, Oregon and Oklahoma are among states affected.
Icy roads have led to a spate of traffic accidents. In Houston, Texas, nearly 120 road crashes were reported on