At least 11 people are dead and several others are missing after intense flash flooding covered roadways and swept away vehicles in San Antonio, Texas, triggered by heavy rainfall the area has not seen in more than a decade.

At least four people are dead, two more are missing and dozens of water rescues have unfolded after the heaviest rain in more than a decade triggered flash flooding in San Antonio, Texas.

The storms are sweeping across the South with millions under flood alerts.