Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Julie Carriat, Reuters)

Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Charles Platiau, Reuters)

Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Charles Platiau, Reuters)

People look on as flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Charles Platiau, Reuters)

Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Charles Platiau, Reuters)

Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Benoit Tessier, Reuters)

Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Benoit Tessier, Reuters)

Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Benoit Tessier, Reuters)

Flames and smoke billow from the Notre Dame Cathedral after a fire broke out in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Benoit Tessier, Reuters)

People react near the Notre Dame Cathedral after it suffered heavy damage from a fire in Paris April 15, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Benoit Tessier, Reuters)

Scaffolding surrounds a section of Notre Dame Cathedral April 16, 2019, after a fire broke out in Paris. Officials said the cause was not clear, but that the April 15 blaze could be linked to renovation work. (CNS photo/Paul Haring)

People travel past Notre Dame Cathedral April 16, 2019, after a fire broke out in the iconic Paris structure. Officials said the cause was not clear, but that the April 15 fire could be linked to renovation work. (CNS photo/Paul Haring)

Treasures saved from the fire at Notre Dame Cathedral are seen in a room in Paris’ city hall April 16, 2019, the morning after a massive fire devastated large parts of the cathedral. Officials said the cause was not clear, but that the April 15 fire could be linked to renovation work. (CNS photo/Benoit Tessier, Reuters)

A reliquary containing what tradition holds is Jesus’ crown of thorns is displayed during a ceremony at Notre Dame Cathedral in Paris March 21, 2014. A major blaze engulfed the iconic cathedral April 15, 2019, sending pillars of flame and billowing smoke over the center of the French capital. (CNS photo/Philippe Wojazer, Reuters)

Smoke rises around the altar inside Notre Dame Cathedral in Paris as a fire continues to smolder early April 16, 2019. Officials said the cause was not clear, but that the fire could be linked to renovation work. (CNS photo/Philippe Wojazer, Reuters)

Smoke rises around the altar in front of the cross inside the Notre Dame Cathedral as a fire continues to burn in Paris April 16, 2019. (CNS photo/Philippe Wojazer, Reuters pool)