Houston–area residents are among those reported dead and missing in Central Texas, where flooding on Friday killed at least 27 people, according to local and state officials.

“I am heartbroken by the devastating flooding in Kerr County, which has claimed more than 20 lives according to the latest report, including young victims from Houston and left others still missing,” Houston Mayor John Whitmire said in a statement Saturday afternoon. “The City of Houston is doing all we can to support the families and response efforts.”

The death toll included 18 adults and nine children, and an untold number more were missing, officials in Kerr County said Saturday.

At least 20 children from Camp Mystic — a Christian summer camp in the Texas Hill Country — were unaccounted for in the Guadalupe River floods that inundated the area on Independence Day.

RELATED: Search continues for missing girls and other survivors of Guadalupe River floods that killed at least 27

In a news release and social media post early Friday night, Harris County Judge Lina Hidalgo said it had been confirmed that at least five of those who died in the floods were from the Houston area. A subsequent statement shortly before 11 p.m. Friday, described as a “correction,” omitted information about local fatalities. A spokesperson for Hidalgo said early Saturday, “we still do not have confirmation on how many of the deceased were Harris County residents.”

“The violent surge of flood waters is something we are all too familiar with,” Hidalgo said in her initial statement Friday. “I pray that emergency personnel are able to promptly find the young girls missing from Camp Mystic. Our Office of Emergency Management stands ready to support in any way needed.”

On Saturday, Kerr County Sheriff Larry Leitha said the death toll from the Guadalupe River flooding had risen to 27. Search rescue efforts continued.

The names of those who died in the flooding were not immediately released by state officials. About 850 people had been rescued in the flood waters as of Saturday. Emergency response officials urged people to avoid the area.

The missing girls from the summer camp included 9-year-old Greta Toranzo, a Houston ISD student, according to the Sinclair Elementary PTO. Camp Mystic is an all-girls camp on the banks of the Guadalupe River, in the heart of an area known as Flash Flood Alley.

Harris County Precinct 4 Commissioner Lesley Briones said in a Saturday afternoon statement that “at least one child” from her Houston–area precinct “has still not been located.”

Several other people from the Houston area were among those missing in Kerr County, according to multiple news reports.