One of four Australians arrested in an international child pornography sting is accused of running an internet chatroom where images of tens of thousands of abuse victims were exchanged.

Officials in the United States say streamed videos of live molestations and photos of victims as young as 18 months were swapped by members of the ring.

"These are the worst imaginable forms of child pornography," US Attorney-General Alberto Gonzales said following the arrests of the four Australians, 13 Americans, 10 Canadians, and two Britons.

"This international undercover investigation revealed an insidious network that engaged in worldwide trafficking in child pornography," Mr Gonzales said.

Queensland police say a 38-year-old Brisbane man is believed to have been an administrator of the pornography swapping chatroom, which gave him the power to decide who accessed the images.

Australian Federal Police also laid child pornography-related charges against a 22-year-old man from the Brisbane suburb of Stafford, and a 30-year-old man from Bennett's Green in NSW.

US officials say the internet chat room - called Kiddypics & Kiddyvids, and operated by a person who allegedly went by the name G.O.D. - used minors to produce porn and then made it available to others through the internet.

"We are confident that those who are immediately involved have been arrested but as the investigation unfolds there may well be more people here in Australia," Mr Drennan told reporters.

"As much as these people think it is an anonymous place and they are free to roam around (the internet), what they need to realise is that there is technology available to law enforcement and we actually use that as an investigative tool," Mr Drennan said.

The Australians aged 22, 30 and 55 will face charges relating to use of a carriage service for child pornography, and possession of child pornography for use through a carriage service.

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