An anonymous reader writes: Anonymous hackers have breached Freedom Hosting II, a popular Dark Web hosting provider, and have taken down 10,613 .onion sites. In a message left on all Freedom Hosting II sites, the hackers claim to have found massive troves of child pornography imagery hosted on the company's servers. The hackers dumped 74GB of server files (half of which they say contained child pornography) and a database dump of 2.3GB. Security researcher Chris Monteiro has analyzed some of the dumped data. He says he discovered .onion URLs hosting botnets, fraud sites, sites peddling hacked data, weird fetish portals, more weird stuff, and child abuse websites targeting both English- and Russian-speaking buyers. Freedom Hosting II hosts about a fifth of all .onion URLs. The first Freedom Hosting service was targeted by Anonymous in 2011 and eventually shut down in 2013 after the FBI also found child pornography hosted on its sites.