Hundreds of rescuers have been deployed to search for people missing in central Texas, after flash floods killed 51 people, including 15 children.
The worst affected area is Kerr County where 43 people havedied and where 27 children remain missing from a Christian youth camp located along the River Guadalupe.
“The work continues, and will continue, until everyone is found,” promised Larry Leitha, the sheriff of Kerr County.
People have also been confirmed dead in other parts of the state, including Travis County and Tom Green County.
Multiple flash flood warnings remain in place over the weekend in central Texas.
About 850 people have been rescued so far.
At a news conference on Saturday afternoon, Texas Governor Greg Abbott said he had signed an expanded disaster declaration to boost search efforts.
He said officials would be relentless in ensuring they locate “every single person who’s been a victim of this event”, adding that “we will stop when the job is completed”.
It remains a search and rescue mission, officials said, not a recovery effort.
They said rescuers were going up and down the Guadalupe River to try to find people who may have been swept away by the floods.
US President Donald Trump said his administration was working closely with local authorities to respond to the emergency.
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Watch: Texans face flood aftermath
Forecasters have warned that central Texas may see more flooding this weekend.
The National Weather Service (NWS) said the area could see 2 to 5in (5cm to 12cm) of rain on Saturday.
Up to 10in of rain was possible in some areas badly affected by Friday’s deluge.
Much of the rescue has focused on a large all-girls’ Christian summer camp called Camp Mystic, located along the banks of the Guadalupe River.
Texas Lieutenant Governor Dan Patrick told the BBC’s Radio 4 PM programme many of 27 missing girls were “under the age of 12”.
Pictures from the camp show it in disarray, with blankets, mattresses, teddy bears and other belongings caked in mud.
Many were asleep when the river rose more than 26ft (8m) in less than an hour in the early hours of Friday.
In an email to parents of the roughly 750 campers, Camp Mystic said that if they had not been contacted directly, their child had been accounted for.
