A South Texas man arrested on charges of sexually assaulting several foster children in the late 2000s fostered nearly 200 girls during that period, authorities say.

Miguel Briseno (Bexar County Sheriff's Office)

"It's not a question about whether there are more" victims, Medina County Sheriff Randy Brown told the San Antonio Express-News. "It's just about how many."

Miguel Briseno, 58, was arrested Wednesday morning in Devine, about 35 miles southwest of San Antonio, as part of an operation by the Bexar County and Medina County sheriff's offices and the Texas Rangers.

Briseno faces three sexual-assault charges out of Bexar County and two out of Medina County.

Brown said more than 180 girls — sometimes up to 12 at once — stayed with Briseno while he had his foster-care license from 2005 to 2010.

An arrest-warrant affidavit indicates that the assaults occurred at homes, in a garage, in a van and at a Bexar County market, KSAT-TV reports. The victims were all teenagers.

One victim told a detective that she was "scared because this was her first foster home and didn't want to be removed to somewhere else," according to the San Antonio Current.

"Those girls were taken from some environment and then you have some [expletive] like him abusing these girls that already have troubles," Brown told the Express-News.

"I'm aggravated at the whole system," he continued. "I'm aggravated at the company that placed these girls. It was a money-making deal, the way they were running those girls through there like livestock. It wasn't about making a better world for them."

Child Protective Services did not comment on the company that placed the children with Briseno.

Brown said authorities are working to identify the scores of children that Briseno housed over the years.

"We don't know where they're at," he told the newspaper.

Briseno is being held at the Medina County jail, with bail set at $500,000.

Court records show that Briseno was arrested on a charge of solicitation to commit sexual assault of a child in Medina County in 2013. He pleaded guilty to a misdemeanor assault charge and was sentenced to six months in jail.