A policeman stands guard outside a school in Antibes, southern France, Oct. 16, 2023. France has heightened the security alert to the highest level after an assailant fatally knifed a teacher and injured three other people in the north French city of Arras on Friday. Security measures have been reinforced around educational establishments. (Photo by Serge Haouzi/Xinhua)
A policeman stands guard outside a school in Antibes, southern France, Oct. 16, 2023. France has heightened the security alert to the highest level after an assailant fatally knifed a teacher and injured three other people in the north French city of Arras on Friday. Security measures have been reinforced around educational establishments. (Photo by Serge Haouzi/Xinhua)
A policeman stands guard outside a school in Antibes, southern France, Oct. 16, 2023. France has heightened the security alert to the highest level after an assailant fatally knifed a teacher and injured three other people in the north French city of Arras on Friday. Security measures have been reinforced around educational establishments. (Photo by Serge Haouzi/Xinhua)
