Police in 12 European countries and the United States have searched 150 homes in a coordinated crackdown on Internet child pornography.
The European Union's police agency, Europol, announced the action Wednesday, saying arrests have been made, but did not report how many.
Europol officials said Dutch police initiated the operation, code named "Baleno," by supplying information to 76 countries around the world.
The operation started last year, when investigators discovered a sophisticated network distributing child pornography. The network used technology to hide its members' identities.
Europol coordinated the operation in Europe, while the FBI handled the probe in the United States.
Some information for this report was provided by AFP, AP and Reuters.