Police in Austria say they have questioned 107 people in an operation against internet child sex abuse.
A man from Vienna has been detained on suspicion of abusing his stepdaughter.
Investigators acting on tip-offs from the United States and Germany seized images and they also found films of two girls, one Asian and one European.
Police questioned the suspects over a number of months but delayed making the details public because of the risk of evidence being destroyed.
Ten of the suspects have already been given suspended jail sentences, ranging from two to five months.
Federal authorities in Austria say the one of the operations, "Orangebill", was prompted by information from the FBI.
Suspects were identified after their credit cards were used to pay for access to a website.
A separate German investigation known as "Sinon" began after police were told of a free website on which images and files had been uploaded.
Austrian officials say 2,500 people worldwide have been questioned in connection with the Orangebill operation.