ELDORADO, Texas (CNN) -- Ambulances rolled into a Texas ranch that's home to members of a polygamist sect, as authorities continued their search Saturday night for possible victims of physical and sexual abuse.



Authorities are seeking Dale Barlow, 50, seen in a mugshot from a 2005 arrest on child sex charges.



The emergency vehicles were called for as investigators prepared to search the group's temple, law enforcement officials said.



The sect is a rogue branch of the Mormon church, which forbids nonbelievers from entering its temples.



Authorities wanted medical backup "in case they're involved in sensitive areas that could escalate into a negative reaction," a law enforcement source said.



A police helicopter also had begun circling the ranch Saturday night.



Earlier, dozens more children and young women were removed from the compound.



A total of 183 people, including 137 children, have been taken away since law enforcement officers raided the compound Thursday night, said Marleigh Meisner, a spokeswoman for the Texas Child Protective Services Division.



The children -- most of them girls -- were being interviewed by special investigators, she said.



"We're trying to find out if they're safe," she explained. "We need to know if they have been abused or neglected."



Eighteen of the girls have been taken into state custody.



Authorities believe that they "had been abused or were at immediate risk of future abuse," said Child Protective Services spokesman Darrell Azar.



The others were taken to a nearby civic center. Meisner described them as doing "remarkably well."  Watch a report on the latest developments »



Authorities continue to search the 1,900-acre YFZ ranch, occupied by followers of imprisoned polygamist sect leader Warren Jeffs, and at least one man is being sought by police.



According to the search warrant, authorities are looking for Dale Barlow, 50, whom they suspect of having married and fathered a child with a 16-year-old girl.  Watch an Eldorado neighbor talk about the raid »



Law enforcement agencies raided the ranch Thursday night after receiving a report Monday that a 16-year-old girl had been "sexually and physically abused," Azar said.  Watch buses take girls from compound »



The warrant cited an "immediate need" for authorities to have access to the 16-year-old and an 8-month-old child with either the last name of Barlow or the girl's last name. It instructs law enforcement officers to look for any records showing that Barlow and the girl were married and any evidence of them having a child.



Barlow is in Arizona and does not know his accuser, his probation officer told The Salt Lake Tribune.



"He said the authorities had called him [in Colorado City, Arizona], and some girl had accused him of assaulting her, and he didn't even know who she was," Bill Loader said.



Barlow pleaded no contest last year to conspiracy to commit sexual conduct with a minor, The Associated Press reported.



He was ordered to register as a sex offender for three years, according to the AP.



His lawyer in that case told the AP he had not spoken to Barlow in a year.



Jeffs, the 52-year-old leader and "prophet" of the 10,000-member church, was convicted in Utah last year and sentenced to 10 years on two counts of being an accomplice to rape, charges related to a marriage he performed in 2001. He faces trial in Arizona on eight charges of sexual conduct with a minor, incest and conspiracy.



Jeffs' Fundamentalist Church of Jesus Christ of Latter Day Saints bought the land near Eldorado four years ago and built the ranch, which they call the YFZ Ranch. The letters are said to refer to the words Yearning for Zion.



It is home to as many as 400 members who relocated from their Arizona and Utah compounds.



State and local law enforcement agencies set up roadblocks around the ranch Thursday evening, preventing journalists from seeing what was happening on the property, according to Randy Mankin, editor of the Eldorado Success weekly newspaper.



"This came totally out of
What is search of the temple expected to turn up? Where is Jeffs in jail awaiting trial? What is the number of children removed from ranch? In which state is Jeffs jailed while awaiting trial? How many children were removed? What is the number of people removed from ranch? How many children were removed from the ranch? How many people were removed? How many years was Jeffs sentenced to prison last year? What state jail is Jeffs waiting trial in?
possible victims of physical and sexual abuse. Texas 137 Arizona 137 183 137 183 10 Utah
question: What is search of the temple expected to turn up?, answer: possible victims of physical and sexual abuse. | question: Where is Jeffs in jail awaiting trial?, answer: Texas | question: What is the number of children removed from ranch?, answer: 137 | question: In which state is Jeffs jailed while awaiting trial?, answer: Arizona | question: How many children were removed?, answer: 137 | question: What is the number of people removed from ranch?, answer: 183 | question: How many children were removed from the ranch?, answer: 137 | question: How many people were removed?, answer: 183 | question: How many years was Jeffs sentenced to prison last year?, answer: 10 | question: What state jail is Jeffs waiting trial in?, answer: Utah