Four of those killed were in a house fire in Texas, with other deaths linked to the bitter cold.

Officials have warned people not to bring grills or propane heaters indoors after carbon monoxide poisoning killed at least two people hospitalized several others.

As an Arctic air mass pushed temperatures to historic lows on Tuesday, several facilities opened their doors as warming centers as volunteers rallied to help.

Rare deep freeze has also forced the closure of some covert vaccination centers.

Officials in Texas have drawn some criticism as the power grid repeatedly failed.

They're forcing rolling blackouts partly because wind turbines had frozen.

Still, treacherous weather is expected to grip much of the country through Friday.

An approaching storm will likely bring more snow, ice and sleet from the Texas Panhandle through Kentucky up through Washington, D.

C.