France, May 12 -- The 27-year-old from Tunisia is suspected of "plotting a violent action inspired by jihadism", according to the anti-terror prosecutors office.

He was arrested on 7 May, after a preliminary investigation was opened the day before into "terrorist criminal conspiracy" and placed in pre-trial detention on Monday.

Citing a source familiar with the investigation, French news agency AFP reported the suspect had been planning to attack a Paris museum and members of the Jewish community, though with no specific target.

Le Monde and Le Parisien newspapers reported that he had considered the Louvre museum as a possible target, as well as the Jewish community in Paris's 16th arrondissement.

Security questions raised after Louvr...