Facebook Inc said on Tuesday it had identified a new coordinated political influence campaign to mislead its users and sow dissension among voters ahead of November’s US congressional elections.

It said it had removed 32 pages and accounts from Facebook and Instagram, part of an effort to combat foreign meddling in US elections.

The company stopped short of identifying the source of the misinformation. But members of Congress who had been briefed by Facebook on the matter said the methodology of the influence campaign suggested Russian involvement.

“I can say I think with pretty high confidence I think this is Russian-related,” Senator Mark Warner, the top Democrat on the Senate Intelligence Committee, told reporters at the US Capitol.

Two US intelligence officials told Reuters there was not sufficient evidence to conclude that Russia was behind the Facebook campaign, but one noted that “the similarities, aims and methodology relative to the 2016 Russian campaign are quite striking.”

A Russian propaganda arm tried to tamper in the 2016 US election by posting and buying ads on Facebook, according to the company and US intelligence agencies. In February, the US Justice Department indicted 13 Russian nationals, and the St. Petersburg-based Internet Research Agency, for interfering in the 2016 US election.

Moscow has denied involvement.

Facebook has been on the defensive about influence activity on its site and concerns over user privacy tied to long-standing agreements with developers that allowed them access to private user data.

The Atlantic Council’s Digital Forensics Research Lab, which was shown the suspended pages ahead of the takedown, said they showed similarities in language and approach to previously fake accounts from the Internet Research Agency, which is known as the “troll factory” because it stirs up public opinion on social media sites.

The lab cited “consistent mistranslation, as well as an overwhelming focus on polarizing issues at the top of any given news cycle.” It said, for example, the posts on the year-old, feminist Resisters page “took a liberal or left-wing stance on issues around gender, race, immigration, and human rights.” Other pages promoted racial pride among minority groups.

The group said the Resisters page was alarming because it was pushing for confrontation at multiple protests, including against “Unite the Right 2,” with a potential for violence.

Sheryl Sandberg, Facebook’s chief operating officer, said on a call with reporters that the attempts to manipulate public opinion would likely become more sophisticated to evade Facebook’s scrutiny, calling it an “arms race.”

Dan Coats, the Trump administration’s director of national intelligence, said in a speech earlier this month that “the warning lights are blinking red again. Today, the digital infrastructure that serves this country is literally under attack.”

The White House said the administration was supportive of Facebook’s actions.

“We applaud efforts by our private-sector partners to combat an array of threats that occur in cyberspace, including malign influence,” said Garrett Marquis, a spokesman for the National Security Council.

US President Donald Trump has come under fire for discounting the threat of interference in the congressional elections.

During his summit with Russian President Vladimir Putin in Helsinki earlier this month, Trump appeared to state that he believed Russia was no longer trying to influence the US election process.

Trump later amended that, saying he was “very concerned” about Russian interference in the election. On Friday, Trump held a meeting with his national security advisers on election security.

The Senate Intelligence Committee had previously scheduled a hearing on Wednesday addressing the online threat to US election security.

Facebook identified influence activity around at least two issues, including a counter-protest to the Unite the Right 2 rally set next week in Washington. The other was the #AbolishICE social media campaign aimed at the US Immigration and Customs Enforcement agency.

In an online post, Facebook said it was disclosing the influence effort now in part because of the rally. A previous event last year in Charlottesville, Virginia, led to violence by white supremacists.

Facebook said it would tell users who had expressed interest in the counter-protest what action it had taken and why.

“This kind of behavior is not allowed on Facebook because we don’t want people or organizations creating networks of accounts to mislead others about who they are, or what they’re doing,” the company said.

More than 290,000 accounts followed at least one of the pages and about $11,000 had been spent on about 150 ads, Facebook said. The pages had created about 30 events since May 2017.

Facebook officials on a call with reporters said one known account from Russia’s Internet Research Agency was a co-administrator of one of the fake pages for seven minutes, but the company did not believe that was enough evidence to attribute the campaign to the Russian government.

The company previously said 126 million Americans may have seen Russian-backed political content on Facebook over a two-year period, and that 16 million may have been exposed to Russian information on the Instagram photo-sharing app.

Over the past several months, the company has taken steps meant to reassure US and European lawmakers that further regulation is unnecessary. Chief Executive Officer Mark Zuckerberg says the company has 20,000 people working to police and protect the site.

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