France vows to rebuild Notre-Dame

A day after a monstrous fire ravaged the roof of Paris’s famed cathedral, investigators are looking for the cause. Already, more than $600 million has been committed to the reconstruction of the 850-year-old landmark.

What we know: The cathedral’s twin medieval towers survived, but its 300-foot spire collapsed and two-thirds of its roof was destroyed.

No one was killed, officials said, but one firefighter and two police officers were injured. Here’s a guide to the latest details and a look at how the fire spread.

The treasures: The fire endangered Notre-Dame’s vast collection of Christian artworks and relics. Some significant items have suffered, but many were saved, including a relic of what many believe is the crown of thorns worn by Jesus.