(From C-L) French Minister for Higher Education and Research Thierry Mandon, French Education Minister Najat Vallaud-Belkacem, French President Francois Hollande and French Prime Minister Manuel Valls observe a minute of silence on November 16, 2015 at the Sorbonne University in Paris on November 16, 2015 to pay tribute to victims of the attacks claimed by Islamic State which killed at least 129 people and left more than 350 injured on November 13. AFP PHOTO / POOL / STEPHANE DE SAKUTIN (Photo credit should read STEPHANE DE SAKUTIN/AFP/Getty Images)

(From C-L) French Minister for Higher Education and Research Thierry Mandon, French Education Minister Najat Vallaud-Belkacem, French President Francois Hollande and French Prime Minister Manuel Valls observe a minute of silence on November 16, 2015 at the Sorbonne University in Paris on November 16, 2015 to pay tribute to victims of the attacks claimed by Islamic State which killed at least 129 people and left more than 350 injured on November 13. AFP PHOTO /  POOL / STEPHANE DE SAKUTIN        (Photo credit should read STEPHANE DE SAKUTIN/AFP/Getty Images)