At least 32 people, including 14 children, have died in flash flooding in south-central Texas, Kerr County Sheriff Larry Leitha said at a news conference Saturday.

Leitha said about 27 girls are still missing at Camp Mystic in Kerr County, Texas, but authorities don't yet know how many others may be missing.

The destructive, fast-moving floodwaters rose 26 feet (8 meters) in just 45 minutes before dawn Friday, sweeping away homes and vehicles.

The danger continues as torrential rains continued to pound communities outside San Antonio Saturday, and flash flood watches and warnings remain in effect.

The sheriff's office, Kerr police and firefighters, and other emergency crews continue search and rescue operations along the Guadalupe River, Sheriff Leitha said.

"We're not going to stop until we find everyone," said Leitha, who said he has all the necessary resources for the operation now.

Search area for survivors expands

As floodwaters recede in Central Texas, ground crews may discover and search additional areas, Texas Emergency Management Chief Nim Kidd said.

"The entire river is being searched, from the northernmost point all the way to the end of the river. There are air personnel still searching. There are boats in the water searching. And there are ground crews as well," Kidd said.

Dogs are also helping search riverbanks where people may be missing, Kidd said. The teams are assigned to different areas and will report back to command if they find anyone, he added.