Two tornadoes were tearing across the Dallas-Fort Worth, Texas metro area on Tuesday, the National Weather Service warned.
"Two tornadoes are currently affecting the DFW (Dallas-Fort Worth) Metroplex. Take cover now!" the service's online alert board said.
The weather service issued a tornado emergency for the metropolitan area.
Local television images showed school buses, trucks and trains cars that had been tossed around, many sustaining significant damage.
"Strong tornadoes are possible with discrete supercell thunderstorms that occur out ahead of the main line of storms. Greatest threat for discrete supercells will from be along and east of Interstate 35. Storms are expected to end from west to east late this evening," the weather service said.
"Severe thunderstorms containing very large hail damaging winds and frequent cloud to ground lightning are expected east of a Decatur, Weatherford, Hamilton, Lampasas line," it added.© ANP/AFP