arrested 30 people in an operation against child pornography on the internet

Spain's Civilian Police have arrested 30 people in an operation against child pornography on the internet, an official source said Wednesday.

"It is the largest operation against child pornography in Spain's history," said Fernando Herrero-Tejedor, the prosecutor designated by the Criminality Information Service (SCI).

"Operation Santiago" ended on Tuesday with the confiscation of 81 computers which had "explicit sex" archives, including "very dense child pornography," in their hard discs, Herrero said.

Most of the cases depicted minors below 13-years of age, for which Penal Code allows prison sentences of between four and eight years if convicted.

Some 350 agents participated in the Civilian Police's action, which was also allowed to trace 1,200 sites in other countries that collaborate with the Spanish