One of the most active members of the group has been identified as Robert K. Carlino, who had been youth minister for the Malaga Assembly of God, New Jersey.
The US judiciary took the evidence from the Serbian police and launched their own investigation on February 18.
Based on evidence provided by the Serbian Ministry of the Interior, the FBI arrested Carlino on March 27, according to the Gloucester County Times newspaper.
During the hearing, Carlino admitted to adopting false personas while online in chat rooms, pretending to be a 13-year-old girl or a mother at the age of 25.
Carlino stated that viewing child pornography became an addiction.