Argentina's police have broken up a paedophile network with international ties that used social media websites to swap pornographic images and videos of children.

Security ministry officials said on Friday that federal police carried out 61 raids last week to dismantle the ring as part of "Operation Oliver".

The covert operation began in February 2011 after local police and Interpol in Britain detected sites in London publishing and swapping pornographic videos with servers in Argentina.

Officials say 64 people were charged but no arrests have been made.

Several computers with images of minors were seized during the raids in nine Argentine provinces and in the capital, Buenos Aires.

Source: Agencies