FBI Supervisory Special Agent Tim Ferguson of the Dayton office said the analysis will help them learn whether there are more suspects or victims in the case. The FBI's computer forensics lab will also provide evidence to help local police and prosecutors develop their cases, he said.
"We're going to identify whether there are any further victims .... and try to determine whether there are more suspects involved," Ferguson said.
A 39-year-old Troy man remained jailed Friday in Miami County on $800,000 bond, charged with three counts of rape and one count of compelling prostitution. He also faces child rape charges filed Thursday in Montgomery County.
His name is being withheld by The Associated Press to protect the children's identities. The public defender's office didn't return messages for comment.
Two other men - 29-year-old Jason Zwick, of Beavercreek, and 31-year-old Patrick Rieder, of Dayton - have been jailed on related rape charges, based on allegations that the adoptive father hired out a 10-year-old boy for sex. Zwick's lawyer hasn't returned a message for comment; an attorney will be appointed for Reider.
Federal authorities could also develop charges such as sexual exploitation in the case, but Ferguson said that will take some time. Federal, state and local authorities met this week to coordinate their investigations.
"Obviously, the most important thing is to make sure we're working for the kids," he said, adding that children's safety is the top priority.
Meanwhile, Ohio and Texas family services officials have been sharing details of the children's adoption from Texas. Texas authorities say the Troy man adopted three children - one of them a 9-year-old girl - in 2011 and was in the process of adopting the fourth.
Troy police said the man regularly had sex with the three boys at his home in a quiet residential neighborhood of ranch homes in this western Ohio city of some 25,000 people. They arrested him last week and seized items including a video camera and two wooden paddles in the master bedroom, along with four laptops and an iPod.
Texas authorities didn't release any other details on the children but said the adoption was handled through ACTION Inc. adoptions agency of Dayton. A Texas spokesman said Thursday that it appeared that proper procedures had been followed, including background checks on the adoptive father. Troy police say they don't know of any past criminal activity by him.
The Ohio Department of Job and Family Services said the man was first certified as a foster parent in Miami County in 2005. ACTION has been certified by the state for more than a decade. Department spokesman Ben Johnson said there had been three complaints involving the private agency in that time, but he didn't immediately release any other information.
Texas Department of Family and Protective Services spokesman Patrick Crimmins said Texas has worked with ACTION since 2004 without previous problems.
Two messages for comment left at ACTION's office in Dayton weren't returned.
