AUSTIN, Texas -- State officials are redoubling efforts to help the homeless amid freezing temperatures.

The National Weather Service issued a hard freeze warning until Wednesday morning for parts of Central Texas, including Austin and south to San Antonio. A freeze warning for South Texas included McAllen, Edinburg, Pharr and Weslaco.

Tuesday's deep freeze stretched across a wide swath of the U.S., from South Texas to Canada and from Montana through New England. In Texas, freezing temperatures were reported in Amarillo, Lubbock, Dallas, Austin and Houston.

Organizations assisting the homeless fanned out Tuesday across Houston to provide blankets and other warm gear.