French Anti-Terror Police on Tuesday arrested four men and one woman and seized weapons in raids days before the presidential election run-off.
Some of the arrests were made in northern France, with two pistols and two machine guns found during one of the raids, sources said.
The suspects were in touch on the social media and some of their messages made authorities fear they were planning violent acts.
The arrests come nearly two weeks after a terrorist shot and killed a policeman on the Champs Elysees in Paris before being killed by police gunfire.
In a bid to pick its next President, France goes to vote on Sunday, with polling stations under high security after more than 230 people were killed in a string of attacks in the country since January 2015.
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