Mostar Bridge is illuminated with the colors of French flag following the massive fire that ravaged the roof of Notre-Dame Cathedral in Mostar, Bosnia and Herzegovina on April 16, 2019. (Photo: IC)

The facade of the Teatro la Fenice illuminated with the colors of the French flag in Venice, Italy on April 16, 2019.

The lookout tower on Petrin hill in Prague was lit in French national colors in memory of the fire-damaged Notre-Dame Cathedral in Paris on April 16, 2019.

An airplane flies past the lit spire of One World Trade Center in New York on April 16, 2019. New York Governor Andrew M. Cuomo has directed One World Trade Center's spire be lit in the colors of the French flag in solidarity with the people of France and the Catholic community worldwide.