Hours after a blaze began to destroy the Notre Dame Cathedral in Paris, French President Emmanuel Macron vowed to a mourning nation: “We will rebuild.”

The cathedral is still engulfed in flames and was seen billowing smoke over the Parisian skyline Monday night. The cathedral’s iconic 300-foot spire collapsed in the blaze, but firefighting officials believe the two main bell towers will survive. Macron said Monday night “the worst has been avoided.”