Those being investigated are suspected of sharing "child and youth pornographic content" including "fictitious and/or real acts of abuse" in anonymous online discussion forums and chat groups.
At least nine boys were knowingly placed with pedophiles by West Berlin officials on the advice of a scientist who was later disgraced for his views.
After the film "Hide and Seek" was seen by almost 80,000 people on YouTube, Polish archbishop Wojciech Polak called on the Vatican to "launch proceedings" into the cases in question.
Richard Huckle, a freelance photographer, was convicted in 2016 for abusing children aged from six months to 12 years. He sold images of the abuse on the dark web.
Former Vatican treasurer Cardinal George Pell appeared in an Australian court for an appeal hearing against his convictions for sexually abusing two choir boys in the 1990s.
The country's police force is being accused of the inept and insensitive handling of the case of 10-year-old Farishta, raising questions about the entire justice system.
More arrests were expected as officials in nearly 60 countries pursue investigations stemming from an Interpol operation launched two years ago into a hidden "dark web" site with 63,000 users worldwide.
23 journalists and 13 news outlets have been accused of aiding and abetting contempt of court by overseas media and breaching suppression orders which can be punished with jail for up to five years.
A German prosecutor's investigation into the child sexual abuse case involving police in Germany's Lugde has revealed gross negligence by the authorities following an array of scandals erupting one after another related to the case.
Roman Catholic priests in northeastern US state sexually abused thousands of children over a 70-year period and silenced victims through "the weaponisation of faith", says a report made public by Pennsylvania Attorney General Josh Shapiro.
Japan on Friday has announced the emergency measures nationwide to confirm the safety of all preschoolers with help of law enforcement officials following the death of a five-year-old girl.
Prosecutors say Ina Rogers' children were also punched, burned with scalding water, shot with weapons such as crossbows and bb guns, and hit with weapons such as sticks and bats.
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