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Anonymous has stepped up its Operation: Death Eaters campaign with a threat to go public with information it has acquired on child sex abuse happening in the UK.

The hacktivist group claims it will end the secrecy surrounding trafficking and the "paedosadist" industry on Friday the 13th - its self-appointed evening of action.

"The stories that are coming out are the torture and murder of children with our trusted politicians and that is unacceptable," said a London-based activist using the pseudonym Jake Davis.

"This isn't a situation where we are looking to create mayhem. It's about giving the public information so we can confront these problems that go back decades," he told Sky News.

The group - which recently attacked ISIS militant websites - claims the objective of #OpDeathEaters is to set up an independent, international victim-led inquiry into what it calls the paedosadist industry.

It also claims - via a creepy video uploaded to YouTube - that masked protestors will march on the houses of "elite" individuals allegedly involved in the child abuse cover ups.

“Friday the 13th will see us become the nightmare on elite street,” the video states - using a computerised voice played over an Anonymous logo.

“You think you are safe. You think we will not directly interrupt your lives. You are wrong. You are the stuff of nightmares.”

“We are calling for an evening of action. On Friday 13th we will march to the homes of some of those involved in this nightmarish cover-up,” the video said.

Anonymous says activists were due to hand out flyers in London, Glasgow, Leeds, Rochdale and Birmingham to help muster support.

The authorities have responded to the group's threats of vigilantism with pleas for anyone with information targeting paedophiles to bring it to the police.

"If there are people that have skills and abilities within Anonymous who actually want to do something positive to help law enforcement and others to inhibit paedophiles operating so freely online, then coming forward and working in some kind of framework would be great," former head of the Child Exploitation and Online Protection centre Jim Gamble told Sky News.

The group calls its grassroots campaign "Operation: Death Eaters" after the followers of Lord Voldemort in the Harry Potter series.