(NBC News) — German police have arrested four members of a gang suspected to be behind one of the world’s biggest child abuse image websites with more than 400,000 members worldwide, police and prosecutors said Monday.

A police operation involving regional and federal German officers raided seven addresses across Germany and arrested three men accused of operating Boystown, a platform for distributing indecent images and video of children, the BKA, Germany’s federal police agency, said in a statement.

Police also arrested one man in Paraguay, who is due to be extradited to Frankfurt. The arrests took place in mid-April but were announced on Monday.

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