Six arrested in France over suspected plot to attack Emmanuel Macron

"The investigation is looking into an imprecise and loosely formed plan for violent action against the President of the Republic," the source said.

France's intelligence agency, the DGSI, said the six people were arrested in three separate regions: Isère, southeast of Lyon; Moselle, on the border with Germany and Luxembourg; and Ille-et-Vilaine, in the northwest near the city of Rennes.

CNN affiliate BFM-TV reported that the suspects belonged to the far right. CNN's judicial source declined to confirm.

The source declined to be named discussing an ongoing investigation.

It comes after Macron warned in an interview with Le Courrier Picard on Sunday of the rising threat of the far-right movement, adding that complacency in the early 1900s paved the way for Hiter's rise in Germany and Mussolini in Italy.

According to Reuters, France's far-right euroskeptic National Rally -- formerly known as the National Front -- is leading the polls against Macron ahead of the European Parliament election in May. The party is led by Marine Le Pen.

CNN's Bianca Britton contributed to this story from London.

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