A 76-year-old Nollamara man and a 32-year-old Swan View man were part of a nationwide online child exploitation ring sharing hundreds of thousands of "abhorrent" images and videos of children being sexually abused, police allege.
The WA men were among 21 people charged this week as part of Operation Conqueror.
Australian Federal Police started the investigation in January after officers allegedly identified people who were using a peer-to-peer file-sharing network to share and distribute the images, many showing children under 10 being abused.
The AFP claims it found one of the child victims and the child was known to one of the people charged and accused of producing, sharing and accessing the images and videos.
Police claimed those charged operated via a peer-to-peer, file-sharing network that allowed them to access each other's computers to view images and videos made in Australia and overseas.
"They will look at other people's computers and basically cherry-pick what they want in terms of imagery and (then) download," Det-Supt Todd Hunter alleged.
AFP cybercrime operations commander Glen McEwen said those charged used specific keyword searches to detect the file-sharing networks but anyone could have accessed the material.
"The material seized can only be described as abhorrent and personally disgusting," he said.
Police raided 36 properties this week and seized hundreds of thousands of images and videos depicting child sexual exploitation.
The Nollamara man was charged with one count of accessing child exploitation material and two counts of possessing child exploitation material.
The Swan View man was charged with one count of accessing child exploitation material and one count of possessing child exploitation material.
Police charged people from every State and Territory except South Australia and Tasmania, ranging in age from 22 to 76.
A woman was among those charged.
'The West Australian' is a trademark of West Australian Newspapers Limited 2013.
All rights reserved.
Select your state to see news for your area.