Commemoration ceremony held for Notre Dame Cathedral in Paris

People look out of the window to see a commemoration ceremony for the cathedral Notre Dame de Paris in front of the Hotel de Ville of Paris in Paris, France, April 18, 2019. A ceremony was held in front of Hotel de Ville of Paris on Thursday to commemorate the cathedral of Notre Dame de Paris which caught fire on Monday afternoon in Paris. (Xinhua/Gao Jing)