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Facebook said on Monday it blocked some 30 accounts on its platform and 85 more on Instagram after police warned they may be linked to "foreign entities" trying to interfere in the US midterm election.
The announcement came shortly after US law enforcement and intelligence agencies said that Americans should be wary of Russian attempts to spread fake news.
The election is on Tuesday.
READ US midterms: Key factors of the 2018 elections
A study published last week found that misinformation on social media was spreading at a greater rate than during the run-up to the 2016 presidential vote, which Russia is accused of manipulating through a vast propaganda campaign in favour of Donald Trump, the eventual winner.
"On Sunday evening, US law enforcement contacted us about online activity that they recently discovered and which they believe may be linked to foreign entities," Facebook head of cyber security policy Nathaniel Gleicher said in a blog post.
"We immediately blocked these accounts and are now investigating them in more detail."
Investigation
The investigation so far identified around 30 Facebook accounts and 85 Instagram accounts that appeared to be engaged in "co-ordinated inauthentic behaviour," Gleicher said.
READ: Obama, Trump clash in final pitches to midterm voters
He added that all the Facebook pages associated with the accounts appeared to be in French or Russian.
The Instagram accounts were mostly in English, with some "focused on celebrities, others political debate".
"Typically, we would be further along with our analysis before announcing anything publicly," Gleicher said.
"But given that we are only one day away from important elections in the US, we wanted to let people know about the action we've taken and the facts as we know them today."
Despite an aggressive crackdown by social media firms, so-called "junk news" is spreading at a greater rate than in 2016 on social media ahead of Tuesday's US congressional election, Oxford Internet Institute researchers said in a study published on Thursday.
Twitter said on Saturday it deleted a "series of accounts" that attempted to share disinformation. It gave no number.
Facebook last month said it took down accounts linked to an Iranian effort to influence US and British politics with messages about charged topics such as immigration and race relations.
The social network identified 82 pages, groups and accounts that originated in Iran and violated policy on co-ordinated "inauthentic" behaviour.
Culprit identity
Gleicher said at the time there was overlap with accounts taken down earlier this year and linked to Iranian state media, but the identity of the culprits has yet to be determined.
Posts on the accounts or pages, which included some hosted by Facebook-owned Instagram, focused mostly on "sowing discord" via strongly divisive issues rather than on particular candidates or campaigns.
Sample posts shared included inflammatory commentary about US President Donald Trump, British Prime Minister Theresa May and the controversy around freshly appointed US Supreme Court Justice Brett Kavanaugh.
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