ISIS claimed responsivility for the coordinated attacks by gunmen and suicide bombers in Paris on Nov. 13 that killed at least 129 people in scenes of carnage at a concert hall, restaurants and the national stadium.
. Prelates arrive for the mass.
. The Archbishop of Paris, Andre Vingt-Trois, during mass.
. French police search worshipers at the entrance of Notre Dame Cathedral.
. People gather outside of Notre Dame cathedral ahead of a ceremony.
. People gather outside the national service for the victims of the terror attacks.
. The Archbishop of Paris, Andre Vingt-Trois says mass in homage to the attacks' victims.
. Paris mayor Anne Hidalgo (R) leans to speak to Vice-President of the conservative Les Republicains politcal party, Nathalie Kosciusko-Morizet during a mass at the cathedral.
. People pray during mass.
. People attend mass at the Notre Dame Cathedral.
. People gather outside the cathedral during a ceremony to honor the victims of last Friday's terrorist attacks.