At least 27 people have died and dozens of children are missing in the Texas Hill Country after catastrophic flooding, with officials warning the casualty count will climb as forecasts call for more rain and the risk of further flash floods in the coming days.

Among those unaccounted for were at least 27 campers from Camp Mystic, an all-girls summer camp along the Guadalupe River in Kerr County, officials said at a briefing. Storms on Saturday on the northwest fringes of the Austin metro area left at least two people dead in Travis County, with another 10 people missing.

Mystic is one of several youth camps in the Hill Country that cater to middle- and upper-class families from Dallas, Houston and Austin who send kids for monthlong getaways at places like Camp Longhorn and Camp Waldemar. Kerrville City Manager Dalton Rice expressed gratitude to the first responders who had poured into the area, and told journalists that authorities were able to confirm that no other camps have missing children.

“We will not stop until every single person is found,” Kerr County Sheriff Larry Leitha told reporters. “We’ve got all the resources we need. We’re here for the long haul. Numbers will be changing rapidly, but we will not stop.”

When the unexpected deluge hit Friday, there were about 750 children at the camp, which is about 85 miles northwest of San Antonio. The Hill Country sprawls across all or part of more than 20 counties in central Texas, with booming Austin and San Antonio on the region’s eastern fringe driving a transformation from ranchland to suburbia.

President Donald Trump said in a social media post that federal officials are working with state and local counterparts, and that Homeland Security Secretary Kristi Noem was en route to the region. Texas Gov. Greg Abbott signed a disaster declaration for 15 counties affected by the floods.

“Our Brave First Responders are on site doing what they do best,” Trump wrote. “GOD BLESS THE FAMILIES, AND GOD BLESS TEXAS!”

The National Weather Service warned of more extreme rainfall and life-threatening flash flooding in parts of the region, issuing a flood watch until Saturday evening for 21 counties in central Texas, and flash flood warnings in much of Austin and the Hill Country. The weather service expects rain throughout the day with isolated downpours reaching 10 inches, with the most severe risks concentrated in areas along Interstate 35. The service also reported numerous water rescues.

Climate change has driven more extreme rainfall around the world. A warmer atmosphere can hold more water, upping the odds of deluges like the one that struck Texas.

Scientists haven’t yet examined these floods for the fingerprints of climate change. A rapid analysis by Colorado State University climatologist Russ Schumacher shows the six-hour rainfall totals made this a 1,000-year event — that is, it had less than a 0.1% chance of occurring in any given year.

The flood took Texas officials by surprise in a region that was packed with campers enjoying the Fourth of July holiday. Thunderstorms, combined with the remnants of short-lived Tropical Storm Barry, produced much more rain than had been forecast.

Nim Kidd, chief of the Texas Division of Emergency Management, said weather predictions underestimated the severity of the storms.

“The amount of rain that fell in this specific location was never in any of the forecasts,” Kidd said.

The weather service didn’t immediately return a message seeking comment.

Rice said officials didn’t issue evacuation orders before the flooding in part due to the region’s many hills and low-water crossings.

“If you spark an evacuation at the wrong time or create an evacuation, you could go into a mass panic and get people on the road, which could be even more deadly by having vehicles swept away,” he said.

The Guadalupe River surged 26 feet in just 45 minutes, Lt. Gov. Dan Patrick said at a briefing Friday. The National Weather Service had predicted only 3 to 6 inches of rain in the area.

Officials declined to give a figure for the total number of people missing, in part because so many visitors came to the area to camp during the holiday weekend.

“We just do not have numbers,” Rice said Saturday.

Of the 27 confirmed dead in the Hill Country, 18 were adults and nine were children. Officials have evacuated around 850 people, and are using helicopters, boats and drones to search for others in need of assistance. Many roads were washed out, limiting access to some areas.

At Camp Mystic, aging bunks with names of former campers carved in the rafters sat on a slope near the river. Some were washed away by the surging waters.

Its website was overloaded with visitors Saturday, according to an error message. Photos said to be of missing children spread on social media, but officials declined to release names of any of the missing.

President Lyndon Johnson’s daughters spent several summers at Mystic among the live oak trees and cedar brush, and former first lady Laura Bush was a Mystic counselor in college, according to Texas Monthly.

Posts on a Facebook page called Kerrville Breaking News were filled with photos of people and pets said to be missing. One woman said she was trying to locate a 19-year-old counselor at Mystic.

“People need to know today will be a hard day,” said Kerrville Mayor Joe Herring.

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(With assistance from Yi Wei Wong, Shamim Adam, Susanne Barton and Brian K. Sullivan.)

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