The attack closed the area around the historic cathedral, and people were asked to stay away.
Witnesses around Notre Dame Cathedral are describing a dramatic police operation in the tourist-filled site in central Paris.
The terrorist who attacked police officers with a hammer outside Notre Dame Cathedral in Paris has been identified as 40-year-old Farid Ikken.
Paris police tweeted that one officer was wounded in the attack.
The Loretto group will be leaving for Spain later this week and is expected to return home by the 17th.
Newly elected President Emmanuel Macron, portrayed by rivals as weak on security during the presidential campaign, ordered the task force to be set up last month to steer France's multiple security agencies from his Elysee Palace offices.
A hammer and kitchen knives were found on the assailant, as well as a student identity card indicating he was from Algeria, Collomb said. During his time in Sweden, Ikken had several stints with both established media, such as Swedish Radio or Uppsala Nya Tidning and up-and-coming "norm-critical" media, such as Fria Tidningen, Ikken's supervisor at Université Panthéon-Assas, professor Arnaud Mercier, said in an interview with French TV channel LCI.
They were being released Tuesday evening one by one after careful police searches.
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No group immediately claimed responsibility for the hammer attack, but Paris prosecutors opened a counterterrorism investigation shortly after the incident.
"I see a face and I say to myself, this guy is determined, and if my colleague doesn't react, I'm going to leave my life here", said the 22-year-old officer, who sustained minor neck injuries and left hospital a day after Tuesday's attack.
Government spokesman Christophe Castaner said the man had "never showed any sign of radicalization" before the attack.
Ikken was shot and wounded by police after he attacked, shouting: "This is for Syria!"
The university of Lorraine's president, Pierre Mutzenhardt, told France Bleu radio that the man was enrolled as one of its students and had been working since 2014 on a thesis about North African media. "Nothing unusual had been detected", he added.
The assailant, a native of Algeria, had worked in Sweden as a journalist and was registered as a graduate student at the University of Metz.
"He was someone who believed a lot in democratic ideals, the expression of free thinking, in journalism", Mercier said. If you would like to discuss another topic, look for a relevant article.
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