Dozens of world leaders are in the French capital to join at least a million people in a unity March. They're honouring people who were killed in several religiously motivated attacks across Paris over the past week. But as France comes to terms with what happened, questions are being asked about what went wrong? Presenter: Hazem Sika Guests: Alain Gresh - Journalist for Le Monde Diplomatique and Specialist on the Middle East. Khaled Diab - Journalist, Writer and Blogger. Renaud Girard - Chief Foreign Correspondent for Le Figaro. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website http://www.aljazeera.com/