KERRVILLE, Texas (AP) — The number of fatalities caused by flash floods surging through Central Texas climbed to at least 67 on Sunday. Rescuers navigating through treacherous landscapes discovered more bodies and continued their urgent search for others, including 11 girls missing from a summer camp.

In Kerr County, search efforts since Saturday afternoon have uncovered 16 bodies, raising the death toll there to 59, according to Sheriff Larry Leitha. Among the deceased were 21 children, he reported.

He pledged to keep searching in that Hill Country region until “everybody is found” from Friday’s flash floods.

Four deaths also were reported in Travis County, three in Burnet and 1 in Kendall.

SLIDESHOW: Devastating flooding hits Texas

Rescuers faced obstacles such as broken trees, overturned vehicles, and debris laden with muck as they undertook the challenging mission to find survivors. Authorities have not disclosed the total number of missing individuals beyond the 11 children and one counselor from Camp Mystic, a Christian summer camp.

Families were allowed to look around the camp Sunday morning while nearby crews operating heavy equipment pulled tree trunks and tangled branches out of the water as they searched along a riverbank. Thunder rumbled from a new storm.

A woman and a teenage girl, both wearing rubber waders, briefly went inside one of the cabins, which stood next to a pile of of soaked mattresses, a storage trunk and clothes. At one point, the pair doubled over, sobbing before they embraced.

With each passing hour, the outlook of finding more survivors became even more bleak. Volunteers and some families of the missing who drove to the disaster zone searched the riverbanks despite being asked not to do so.

Authorities faced growing questions about whether enough warnings were issued in area long vulnerable to flooding and whether enough preparations were made.

The destructive, fast-moving waters rose 26 feet on the river in only 45 minutes before daybreak Friday, washing away homes and vehicles. The danger was not over as flash flood watches remained in effect and more rain fell in central Texas on Sunday.

Searchers used helicopters, boats and drones to look for victims and to rescue people stranded in trees and from camps isolated by washed-out roads. Officials said more than 850 people were rescued in the first 36 hours.

Prayers in Texas — and from the Vatican

Gov. Greg Abbott vowed that authorities would work around the clock and said new areas were being searched as the water receded. He declared Sunday a day of prayer for the state.

“I urge every Texan to join me in prayer this Sunday — for the lives lost, for those still missing, for the recovery of our communities, and for the safety of those on the front lines,” he said in a statement.

In Rome, Pope Leo XIV offered special prayers for those touched by the disaster. History’s first American pope spoke in English at the end of his Sunday noon blessing, “I would like to express sincere condolences to all the families who have lost loved ones, in particular their daughters who were in summer camp, in the disaster caused by the flooding of the Guadalupe River in Texas in the United States. We pray for them.”

The hills along the Guadalupe River are dotted with century-old youth camps and campgrounds where generations of families have come to swim and enjoy the outdoors. The area is especially popular around the Independence Day holiday, making it more difficult to know how many are missing.

“We don’t even want to begin to estimate at this time,” Kerrville City Manager Dalton Rice said on Saturday.

Harrowing escapes from floodwaters

Survivors shared terrifying stories of being swept away and clinging to trees as rampaging floodwaters carried trees and cars past them. Others fled to attics inside their homes, praying the water wouldn’t reach them.

At Camp Mystic, a cabin full of girls held onto a rope strung by rescuers as they walked across a bridge with water whipping around their legs.

Among those confirmed dead were an 8-year-old girl from Mountain Brook, Alabama, who was at Camp Mystic, and the director of another camp up the road.

Locals know the area as “ flash flood alley” but the flooding in the middle of the night caught many campers and residents by surprise even though there were warnings.

Warnings came before the disaster

The National Weather Service on Thursday advised of potential flooding and then sent out a series of flash flood warnings in the early hours of Friday before issuing flash flood emergencies — a rare alert notifying of imminent danger.

At the Mo-Ranch Camp in the community of Hunt, officials had been monitoring the weather and opted to move several hundred campers and attendees at a church youth conference to higher ground. At nearby Camps Rio Vista and Sierra Vista, organizers also had mentioned on social media that they were watching the weather the day before ending their second summer session Thursday.

Authorities and elected officials have said they did not expect such an intense downpour, the equivalent of months’ worth of rain for the area.

U.S. Rep. Chip Roy, whose district includes the ravaged area, acknowledged that there would be second-guessing and finger-pointing as people look for someone to blame.