Dozens of people have died after heavy rain pounded Kerr County, Texas, early Friday, leading to "catastrophic" flooding, the sheriff said.

Officials said more than 850 people had been rescued after a sudden storm dumped up to 15 inches of rain across the region.

Although Kerr County was hit hardest by flooding, at least seven others have been confirmed dead in different parts of Texas. About 150 miles east of Camp Mystic, Travis County has confirmed at least six deaths, the county confirmed Sunday. Travis County includes the Texas capital city of Austin.