Texas Governor Greg Abbott in Austin declared a disaster in four counties, including Dallas County, which covers Garland, and Rockwall County, which covers Rowlett.
Collin and Ellis counties were also declared a disaster. The Fort Worth office of the National Weather Service said there was an unconfirmed report of a tornado in eastern Ellis.
The full extent of damage along a nearly 40-mile stretch near Dallas was becoming clear yesterday: houses destroyed, vehicles mangled, power lines down and trees toppled. Crews were busy scouring debris for possible storm victims and assessing the damage in North Texas.
The agency also said that the damage left behind in nearby Rowlett was from a tornado that was at least EF-3, which have gusts of between 136 and 165 mph.
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An EF-2 tornado struck Copeville, northeast of Dallas, the National Weather Service said.
Eight of the deaths were in Garland, Garland Police Lt Pedro Barineau said yesterday morning. Fifteen people were hurt and 600 structures were damaged.