From left: German chancellor Angela Merkel, German Parliament president Norbert Lammert, the partner of German President, Daniela Schadt, German President Joachim Gauck, and the North Rhine-Westphalia governor Hannelore Kraft attend a mourning ceremony at the Cologne Cathedral in Cologne, Germany, Friday, April 17, 2015. A mourning ceremony is held in the Cathedral in memory of the 150 victims of the Germanwings plane crash last month in the French Alps.