French Interior Minister Manuel Valls (2nd R) leaves after visiting the Grand Mosque of Paris on October 15, 2013 in Paris, during the Muslim celebrations of Eid al-Adha. Muslims across the world are celebrating the annual festival of Eid al-Adha, or the Festival of Sacrifice, which follows the annual pilgrimage to Mecca, and commemorates the willingness of biblical patriarch Abraham to sacrifice his son Ishmael. AFP PHOTO / MARTIN BUREAU