Several more vehicles also crashed into the truck amid dense fog around the crash scene on Highway 84 in Lubbock County, Texas, the news channel reported.
President Trump led the condemnation over 'an act of cowardice' that police are treating as a possible hate crime, calls rang out to end the 'epidemic' of gun violence.
The United States was in mourning on Sunday for victims of two mass shootings that killed 29 people in less than 24 hours as debate raged over whether President Donald Trump's rhetoric was partly to blame for surging gun violence.
Dramatic videos and photos shared on social media showed a large blast, with one resident describing waking up to a huge boom and "glass all over us".
One victim died at the scene, and another six were transported to a hospital, where one was pronounced dead shortly after arrival.
In response to the guidelines set by the Centers for Disease Control and Prevention (CDC), the city of Amarillo temporarily closed the Amarillo Civic Center Complex for all its gatherings and events, according to its website.
A hurricane warning is in effect for Port Mansfield to Mesquite Bay, a span that includes Corpus Christi. A tropical storm warning is in effect from Barra el Mezquital, Mexico, to Port Mansfield, Texas, and from Mesquite Bay to High Island, Texas.
The NHC forecast that Hanna would lose steam as it moved inland across Texas and northeastern Mexico overnight into Sunday. But the storm could dump upward of 18 inches of rain in the area through on Monday.
Footage posted during a Facebook Live showed the moment when several shots rang out as a group of about 100 people marched and chanted "fists up! Fight back!"