Over 100 people have died after heavy rain pounded Kerr County, Texas, early Friday, leading to "catastrophic" flooding, the sheriff said.

Gov. Greg Abbott surveyed the flood damage via helicopter Tuesday afternoon with Texas House Speaker Dustin Burrows.

According to Lt. Gov. Dan Patrick, at least 20 children are unaccounted for at Camp Mystic, an all-girls camp of 750 campers. He says this does not mean they've been lost. "They could be in a tree. They could be out of communication. We're praying for all those missing to be found alive," he said.