The temple "contains an area where there is a bed where males over the age of 17 engage in sexual activity with female children under the age of 17," according to a court affidavit, citing the confidential informant.
Police say they have found plenty of indications that the group considered young girls to be eligible for "spiritual marriages" to older men. Court documents noted that among the children there was a 16-year-old girl who had given birth to four children.
It took police a week to completely search the sprawling compound; the sect's temple was the last place that was searched. Authorities had to force their way past the locked doors as male members of the sect surrounded the temple, praying and crying.
The FBI also searched the compound on Tuesday, but the documents related to that search remain sealed, according to a statement from the U.S. Attorney's Office. An FBI spokesman in Dallas declined to comment.
The church still has large communities along the border between Utah and Arizona.
Sam Brower, a private investigator who has been looking into the church for years, told ABC World News that sect leader Warren Jeffs sent his most loyal followers from those communities to the Texas compound.
"Well you see a lot of underaged girls pregnant," said Isaac Wyler, a former church member. "And around here if a girl's pregnant, she's married."