The Security Ministry said officials tracked the suspects' illicit Internet traffic, which included pornographic material involving minors.
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"We identified the IP addresses of the computers containing pornographic material and located the physical locations from which the data was transmitted," the ministry said in a statement.
Officials said some of the children depicted in the pornographic images were younger than 10.
The investigation began in February 2011 when Internet sites in London were found to have child porn uploaded from servers located in Argentina.
"It was determined that a group of people engaged in advertising, distributing and marketing the pornographic images showing children," said Dario Ruiz, Argentina's undersecretary for security.
London police alerted Interpol and Argentina's federal police, who were able to identify the suspects.
Officials said that during a raid on one home in the city of La Plata, some 40 miles south of the capital Buenos Aires, police confiscated 14,000 pornographic images containing children, as well as numerous DVDs, memory cards and computer hard drives.
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