At least 11 people have been killed in Texas after tornadoes tore through the Dallas area.
The storm system brought torrential rain and unleashed a string of deadly tornadoes that tore down home, cut power lines and brought the transport system to a grinding halt for people turning from Christmas holidays.
The worst hit area was in Garland, northeast of Dallas, where eight people were killed.
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Officials said cars had been blown off highways and homes had been flattened by the storm on Sunday.
Three other deaths were reported in the Dallas metro area, the nation’s fourth most populous, with about 7 million people.
Five of the deaths in Garland were believed to have been related to vehicles having been struck by a tornado near State Highway 190 and Interstate 30.
More than 600 structures in North Texas suffered damage from the tornadoes and storms, officials said.
Six tornadoes were reported in Texas and one in Oklahoma on Saturday, the National Weather Service said.
The service has issued severe weather warning for large parts of the central United States on Sunday that include a blizzard warning for parts of New Mexico, Texas, Oklahoma and Kansas and a flash flood watch stretching from Texas to Ohio.
The weather has forced the cancellation of hundreds of flights across the United States.
The weekend tornadoes follow a series that hit just before the Christmas holiday, mostly in the US South, and leaving at least 17 dead.