A man who was arrested after attempting to breach security around the Eiffel Tower in Paris has been moved back to psychiatric hospital.
The iconic landmark in the French capital was placed on a short lockdown after a young man reportedly brandished a knife, allegedly running past security and screaming "Allahu Akhbar."
The incident took place late on Saturday, just before the closing time, resulting in the tower being evacuated.
There were no injuries or fatalities, and the tower re-opened as usual on Sunday morning.
The Paris prosecution office said on Tuesday the 19-year-old - who is French-born - had been evaluated by a psychiatrist and deemed unfit to stand trial over the incident.
News outlet 20 Minutes is reporting he had been on psychiatric leave to visit his family, but has now been returned to hospital care.
France remains on high alert after a series of high-profile terrorist attacks in 2015 and 2016, which have seen a number of deaths across France.
There has been particular concern for security services which guard prominent tourist destinations, after a man wielding a machete attacked soldiers on patrol in the Louvre museum in February.
Another attacker shot and killed a police officer on the Champs Elysees in May, while a policeman came under attack with a hammer from an Algerian student who had sworn allegiance to Islamic State at Notre Dame Cathedral.