A man is silhouetted against a video screen with an Facebook logo as he poses with a laptop in this photo illustration taken in the central Bosnian town of Zenica, August 14, 2013.
Facebook Inc blocked about 115 user accounts after US authorities tipped it off to suspicious behavior that may be linked to a foreign entity, the company said in a blog post on Monday, hours before USA voters head to the polls.
The tip came from US law enforcement on Sunday night, Nathaniel Gleicher, Facebook's head of cybersecurity policy, wrote in the post.
"Typically, we would be further along with our analysis before announcing anything publicly".
The Instagram accounts were mostly in English, with some "focused on celebrities, others political debate".
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"Given that we are only one day away from important elections in the United States, we wanted to let people know about the action we've taken and the facts as we know them today", Gleicher wrote in his post.
Facebook said it planned to release more information as the investigation continues.
Facebook has since tried to clamp down on nefarious foreign actors.
A man works at his desk in front of monitors last month during a demonstration in the war room, where Facebook monitors election-related content on the platform, in Menlo Park, Calif. Facebook also disclosed sophisticated attempts from Russian Federation to interfere with elections and promote political discord in the U.S.
Facebook company opened a war room earlier this year in an effort to combat election interference around the globe. "We prohibit coordinated inauthentic behavior on Facebook because we want people who use our services to be able to trust the connections they make".