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

At least 27 campers and counselors were killed at Camp Mystic during the devastating Texas floods, the camp said in a statement. Some remain missing.

About two dozen people were still missing. Many more people could still be unaccounted for, officials warned, noting that visitors to the area for the July 4th weekend make it difficult to assess an exact number.