France Heightens Security Level Following Fatal Knife Attack at School

France has raised its security level to the highest state of counter-terrorism alert after a knife attack at a school in Arras. The assailant, a 20-year-old Russian national of Chechen origin, fatally stabbed a teacher and seriously wounded two others. The attacker, known to the security services for his involvement with Islamist extremism, shouted "Allahu Akbar" during the attack. The incident comes amid rising tensions in France's Muslim and Jewish communities due to the Israel-Hamas conflict. French President Emmanuel Macron condemned the attack and called for unity in the face of Islamist terrorism.