A religious retreat built by imprisoned polygamist leader Warren Jeffs was sealed off on Friday to permit the Child Protective Services (CPS) to check on the way children living inside are treated, officials said Friday.

The inquiry conducted by the CPS is still under way and authorities couldn’t yet say whether any children inside the religious retreat would be removed, said spokeswoman Marleigh Meisner. She added that investigators were granted access inside the retreat 1,900-acre ranch near Eldorado by the Texas Department of Public Safety and other law enforcement.

At the moment no one is allowed to enter or leave the south central Texas retreat inhabited by more than 400 Warren Jeff followers. The people living at the ranch are cooperative, authorities said. However, the social workers were escorted by police when they entered the ranch at about 8 p.m. Thursday.

"There are DPS cars on the road blocking all entrances into that area," said Schleicher County Justice of the Peace James C. Doyle.

Child Protective Services "is conducting an investigation into safety issues of the children who live within the compound," said Meisner in a statement. She added that her agency had not yet “determined that there is a safety issue with these children."

The Fundamentalist Church of Jesus Christ of Latter Day Saints (FLDS) bought approximately 1,900 acres near Eldorado about four years ago. There they build the ranch and called it the YFZ Ranch. About 400 members of the church were relocated from their Arizona and Utah compounds to the YFZ Ranch.

Since 2002, when his father died, the community has been led by Warren Jeffs. It’s one of the several religious groups which spread from the Church of Jesus Christ of Latter-day Saints after the Mormon Church renounced polygamy in 1890.

Jeffs, the 52-year-old leader and "prophet" of the 10,000-member church, was later convicted for involvement in the rape of a 14-year-old girl in 2001, the year when she wed her cousin in an arranged marriage. In Utah, he was sentenced for to two consecutive sentences of five years to life in prison.

In Arizona, Jeffs also faces charges as an accomplice of incest and sexual conduct with a minor stemming from two arranged marriages similar to that above mentioned. He is now behind bars the Mohave County Jail in Kingman, Ariz., awaiting trial.