Dozens of people are dead in central Texas in what officials called a "mass casualty event" after devastating flash floods slammed Hill Country, with water rescues taking place along the Guadalupe River.

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.

In central Kerr County, up to 10 inches of rain inundated the area, causing the Guadalupe River to swell and overflow its banks.