PARIS/NICE, France (Reuters) - France stepped up security nationwide on Friday to guard against Islamist attacks after the fatal stabbings at a church in Nice, while protests flared in parts of the Middle East, Asia and Africa over French caricatures of the Prophet Mohammad.President Emmanuel Macron deployed thousands of soldiers to protect sites including places of worship and schools, and the nation was at its highest level of security alert after the second deadly knife attack in its cities in two weeks. Police were holding a 21-year-old Tunisian migrant, identified by a French police source and Tunisian officials as Brahim al-Aouissaoui, over the attack in which a man shouting “Allahu Akbar” (God is Greatest) decapitated a woman and killed two other people in Notre Dame Basilica in Nice on Thursday. The attack took place at a time of growing anger among Muslims in many countries over the issue of French cartoons of the Prophet Mohammad, which they deem insulting and blasphemous. It occurred almost two weeks after Samuel Paty, a school teacher in a Paris suburb, was beheaded by an 18-year-old Chechen. Paty had shown his pupils such cartoons in a class on freedom of expression. France, home to Europe’s largest Muslim community and hit by a string of militant attacks in recent years, has defended the right to publish such cartoons. Macron has insisted France will not compromise on its basic freedoms of belief and expression. In Pakistan, Bangladesh and the Palestinian territories, tens of thousands of Muslims staged anti-French protests after Friday prayers. In Islamabad, police briefly fired tear gas at protesters who broke through security blockades in a failed attempt to demonstrate at the French embassy. In Bangladesh, marchers in the capital Dhaka chanted “Boycott French products” and carried banners calling Macron “the world’s biggest terrorist”. Some burned effigies of the French president. “Macron is leading Islamophobia,” said Dhaka demonstrator Akramul Haq. “The Muslim world will not let this go in vain. We’ll rise and stand in solidarity against him.” Protests also took place in India, Lebanon and Somalia.