Much of the US is in the grip of yet another cold snap, with snow forecast even in the usually balmy Deep South.
The winter storm is expected to take hold over the next two days from Mississippi to South Carolina.
A state of emergency has been declared in Louisiana, whose governor warned locals to remain indoors. Many schools are closed and road crews are at the ready.
About 3,000 flights were grounded by weather on Tuesday.
Forecasters predicted up to 1ft (30.5cm) of snow in parts of Virginia and up to 10in along the North Carolina coast.
Unusual 'rollers' phenomenonIce storm warnings were issued in Texas and Louisiana, and officials cautioned locals to be prepared for the adverse weather.
"This is a very dangerous situation because snow and ice are very rare... We need everyone to have an emergency plan together for this," Robert Latham, executive director of the Mississippi Emergency Management Agency, told USA Today.
Four people died in Itawamba County, Mississippi, when a fire destroyed a mobile home containing nine people. Investigators believe a heater caused the blaze.
Parts of the US Midwest meanwhile were struggling through another bout of near-record cold temperatures.
Schools were closed in several central US states for a second consecutive day because of the cold.
Parts of Minnesota recorded temperatures as low as 35 to 50 degrees below zero Fahrenheit as the state struggled with a shortage of natural gas due to an earlier pipeline explosion in Canada.
Residents in the US states of Ohio, Illinois and Pennsylvania also witnessed an unusual phenomenon due to the weather.
Numerous naturally occurring donut-like snowballs - known as snow rollers and formed when wind blows snow along the ground - were reported.
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