Nude images posted online of girls from 70 schools across the country will likely remain in cyberspace forever, police warn.
The Australian Federal Police is working with state counterparts to shut down an online pornographic forum that encourages boys to post naked pictures of underage girls to the site without their consent.
However, Detective Senior Sergeant Dave Miles, from Queensland, warned it would be impossible for police to remove all the images.
"The reality is, that once that image is up on the internet, it is there forever," Det Sen Sgt Miles said.
"We can't take it down.
"There is nothing that any policing agency in the world can do to stop these images being shared to the broader world wide web, and they will just go from site to site to site."
Police in other states have issued similar warnings.
Authorities have also warned that the site itself would be difficult to shut down, given it's hosted on an overseas server.
The forum reportedly contains images of girls from 70 schools, including 29 in NSW, 17 in Queensland, 15 in Victoria, five in ACT and two each in South Australia and Tasmania. No schools are thought to have been involved from WA.
State education departments have condemned the site, with Victoria's Department of Education and Training labelling it "disgusting".
Queensland's education department said it was working to protect students after learning about the website.
"This website is highly offensive. We will work with other agencies including police as a matter of urgency to ensure the safety and wellbeing of all our students," a spokesman said.
An online petition, which had garnered about 700 signatures on Wednesday afternoon, called for the federal government to shut the "vile" site down.
"This demeaning, misogynistic site devalues our young women, turning them into fodder for men to ogle and sexualise unfettered and without fear of legal repercussions," the petition read.
An AFP spokeswoman said child pornography was a serious offence, even if the perpetrator was a child themself.
Child pornography offences carry a maximum penalty of 15 years' prison, she said.
Australian Privacy Commissioner Tim Pilgrim said the exploitative images linked with personal information would be tough for any of the students involved and their parents to deal with.
"An invasion of privacy such as this is any parent's nightmare, and the young women involved deserve every support we can offer," Mr Pilgrim said in a statement.