What fuels Islamic extremism in France?

Since an attack at the magazine Charlie Hebdo in early 2015, more than 200 people have been killed in terror attacks by Islamic extremists in France. A new book, “Terror in France: The Rise of Jihad in the West,” by Gilles Kepel, discusses the roots of Islamic extremism there and unrest within French Muslim communities. Kepel, a professor at Paris Sciences et Lettres, joins Hari Sreenivasan.