Video filmed from inside a fire truck shows flames towering above the road as thick smoke obscures the view.
Out-of-control fires across the Texas Panhandle – the northern-most region of the US state – have affected more than 250,000 acres (1,000 sq km) of land, triggering evacuations, road closures and power cuts.
Pantex, a key nuclear weapons plant, was forced to suspend operations until further notice.