A U.S. couple was indicted Thursday on charges of sexually abusing children at a Brazilian nudist colony, a court official said.

Frederic Calvin Louderback, 63, of San Diego, and his companion Barbara Anner, 72, could face up to 30 years in prison if convicted of sexually abusing children, corrupting minors and conspiracy, court official Renata Savian said.

Attorneys for Louderback and Anner did not immediately return calls seeking reaction, though they earlier denied the charges, which involve children aged 6 to 14.

Also indicted were Andre Ricardo Herdy and Cleci Jaeger — a Brazilian couple suspected of helping the Americans — and three boys' parents who were allegedly paid to let their children be abused.

Police also say that hundreds of photos of young boys engaged in homosexual acts were found in the homes of both couples.

The two couples lived in the Colina do Sol nudist colony in Rio Grande do Sul state until their Dec. 11 arrest.

Prosecutors say Anner lured the boys, all of whom lived in poor neighborhoods near the colony, with promises of gifts, food and trips.

One of their attorneys, Vitor Peruchin, said the two believed they were set up by wealthy members of the colony who didn't like their work for the poor — giving free English lessons to children, promoting sports activities and donating food, clothes and toys.

Police say Anner is originally from Georgia, although she authored an article on a Web site promoting Colina do Sol that said she had lived in Southern California.