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LONDON (Reuters) - Iranian hackers suspected of emailing threatening messages to U.S. voters last week and spreading false information about compromised election systems ran a disinformation campaign last year targeting the Middle East, Facebook Inc FB.O said on Tuesday.

FILE PHOTO: FILE PHOTO: A 3D-printed Facebook logo is seen placed on a keyboard in this illustration taken March 25, 2020. REUTERS/Dado Ruvic/Illustration

U.S. officials blamed Iran last week for thousands of threatening emails and an online video that purported to show hackers breaking into a voter registration system just days before the U.S. presidential election. Tehran has denied the allegations.

Facebook said it had suspended one fake account which attempted to share the video on its site. That account in turn led to more than 20 other accounts on Facebook and Instagram, revealing a dormant disinformation operation that had targeted countries including Israel and Saudi Arabia in 2019, the company said.

Nathaniel Gleicher, Facebooks head of cybersecurity policy, said the newly-discovered accounts were largely inactive, but had previously attempted to spread claims about an alleged massacre at last years Eurovision Song Contest in Israel.

U.S. intelligence agencies are still analysing who exactly in Iran commanded the operation and its intent, three people with knowledge of the matter told Reuters last week.

Gleicher said on Tuesday his team found a small number of technical links to a disinformation network suspended in April that was attributed to Irans state broadcaster, as well as connections to individuals associated with the Iranian government.

Facebook also said it had suspended two pages and 22 Instagram accounts run by people from Mexico and Venezuela that used fake identities and other forms of so-called coordinated inauthentic behaviour to post about current events and politics in the United States.

Some of the accounts posed as Americans and posted in Spanish and English about topics including race relations, feminism and the environment, Facebook said. They were identified following a tip from the FBI, it added.

While it was not clear who was behind the activity, some accounts posted captioned pictures previously used by the Internet Research Agency, the Russian organization U.S. prosecutors have said played a key role in Moscows efforts to sway the 2016 U.S. election.

Gleicher said both networks, as well as a third operation targeting Internet users in Myanmar, had been caught before they could attract significant followings.

But he said malicious actors were increasingly using concerns about their own election interference attempts to further sow distrust and division.

We call it perception hacking, he said. Rather than actually breaking into a sensitive voter database or using a large social influence campaign, you just play on everyones fear that it exists.

Reporting by Jack Stubbs; Editing by Edward Tobin

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Facebook says suspected Iranian hackers behind U.S. election threats operated in 2019 - Reuters