A man has been given preliminary terrorism charges for plotting a possible attack on President Emmanuel Macron or minority groups, French authorities said.
Paris prosecutor's office spokeswoman Agnes Thibault-Lecuivre said on Monday that the 23-year-old suspect's plans were vague and not yet finalised, and that he appeared to be acting alone.
She said the man was arrested in the Argenteuil suburb on Thursday, and told police of a possible plan to attack Mr Macron on Bastille Day on July 14 and expressed nationalist views.
The man was given preliminary charges on Saturday of individual terrorist activity.
Mr Macron will oversee a military parade in Paris on Bastille Day alongside President Donald Trump.
Mr Macron then heads to Nice to mark the anniversary of the Islamic extremist lorry attack that killed 86 people in the southeastern city.