The death toll from devastating floods in the Texas Hill Country rose to 24 Friday night, officials said, as the search for more than 20 people missing from a girls summer camp continued through the night.

Authorities have said thirteen people have died in Kerr County in the US state of Texas amid a bout of severe weather and flooding. Others remain unaccounted for - including around 20 children who had been at a summer camp.

At least 24 people are dead following extreme flooding that slammed Texas Hill Country overnight on Friday, according to officials. At least 20 girls from a summer camp remain missing.