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Seven killed in US storms
A street sign is bent at a severe angle from a Christmas tornado. Picture: AP

A massive Christmas storm that whipped up tornadoes, ice and snow from the Gulf of Mexico to the Great Lakes has killed at least seven people and grounded more than 2000 US flights.

The storm snarled holiday travel as people were warned to stay home rather than brave the strong winds, freezing temperatures and treacherous roads.

The National Weather Service warned of “dangerous travel conditions due to snow and ice covered roads” and said the weight of ice and snow could knock down power lines and trees.

Already, more than 200,000 people were without power, with tens of thousands of holiday travellers stranded across the country.

The weather service forecast up to 46cm of snow from New York state up to Maine and warned of freezing rain, tornadoes and severe thunderstorms all the way down to the Carolinas.

Areas in the Rocky Mountains were also set to get about a foot of snow from a second storm system on Wednesday.

Albion, Illinois had already recorded 47cm of snow by Wednesday afternoon while parts of Pennsylvania had recorded as much as half an inch of freezing rain as the storm continued to pound the region.

The Indiana state police said it had responded to 159 crashes near Indianapolis - many of them with multiple vehicles - in just the first few hours of the storm.

More than 1500 US flights had been cancelled by Wednesday evening, after 536 were grounded on Tuesday, according to flight tracker FlightAware.

Another 276 were already called off for Thursday.

“The biggest factor on both coasts is high winds and winds not aligned with runways,” FlightAware chief Daniel Baker said.

“This causes significant capacity constraints that lead to long delays and cancellations.”

The National Basketball Association meanwhile postponed a Wednesday night game in Indianapolis between the Indiana Pacers and the Chicago Bulls, saying it would be rescheduled.

Scores of homes and businesses were damaged on Tuesday after 34 tornadoes were reported in the southern US states of Texas, Louisiana, Alabama and Mississippi.

The governors of both Mississippi and Alabama have declared states of emergency.

More than 200,000 people remained in the cold and dark o Wednesday after the storm knocked down power lines in Arkansas, Mississippi and Texas.

The regional utility company said it was bringing in outside crews to help, but it could be a week before service was fully restored.

“Road conditions are making travel very dangerous and slow,” Entergy said.

“In addition, the threat of falling trees and tree limbs poses a substantial risk to our crews who are working to restore power as quickly as safely possible.”

Two children were killed after their mother lost control of her vehicle on an icy road in Arkansas on Christmas Day, the State police said.

Another person was killed in the State early on Wednesday as a result of the storm, the Arkansas emergency management service said.

A dozen people were hurt in a 21-vehicle pile-up caused by icy roads in Oklahoma City that started when a truck jack-knifed on a major interstate and oncoming cars were not able to stop on the icy roadway, the Oklahoman reported.

Two women were killed in separate crashes in the state on Christmas Day, the state highway patrol said.

A man was killed in rural Louisiana when a tree hit his home on Christmas Day, and a Texas man died in similar circumstances in a Houston suburb, local media reported.