KERRVILLE, Texas — Months worth of heavy rain fell in a matter of hours on Texas Hill Country, leaving 24 people dead and many more unaccounted for Friday, including more than 20 girls attending a summer camp, as search teams conducted boat and helicopter rescues in fast-moving floodwaters.

Desperate pleas peppered social media as loved ones sought any information about people caught in the flood zone. At least 10 inches (25 centimeters) of rain poured down overnight in central Kerr County, causing flash flooding of the Guadalupe River.

At a news conference late Friday Kerr County Sheriff Larry Leitha said 24 people had been killed. Authorities said 237 people had been recued so far, including 167 by helicopter.

The situation was still developing and officials said the death toll could change, with rescue operations ongoing for an unspecified total number of missing.

Authorities were still working to identify the dead.

Pleading for information after flash flood A river gauge at Hunt recorded a 22 foot rise (6.7 meters) in about two hours, according to Bob Fogarty, meteorologist with the National Weather Service's Austin/San Antonio office. The gauge failed after recording a level of 29 and a half feet (9 meters).

"The water's moving so fast, you're not going to recognize how bad it is until it's on top of you," Fogarty said.

AP