Arturo Dodero Tello, 29, is accused of pretending to be a young boy to gain the trust of his victims, all of whom were between the ages of 6 and 10 years old, ThinkSpain reported Monday.
Once they became friends, Dodero would talk them into letting him take photos and videos of them in their underwear with their computer web cam, police said. He would eventually blackmail the girls into posing naked or practicing "acts of zoophilia."
Dodero would allegedly distribute the images on private online discussion boards.
His arrest came after Spanish investigators uncovered some of the private networks early this year. A photo of a girl wearing a school shirt was traced to a student at a primary school in the Canary Islands, who gave investigators Dodero's email address.
Dodero was arrested Saturday after authorities tracked his email address to a home in Lima, officials said.
Police said they found a hard drive hidden in a bedroom wall that contained about 200 videos.
Dodero is alleged to have also conducted his scheme against children in Argentina, Chile, Peru and Ukraine.