According to ICN:
Prime Minister Theresa May said: “Notre-Dame is one of the most beautiful buildings in the world… and cherished across the globe. The images of destruction we saw last night were truly heart-rending.
“To underline our solidarity with France and her people, the bells at Westminster Abbey will toll at 5.43pm this evening to mark the moment the fire began yesterday. And…on Maundy Thursday, bells will ring at cathedrals and churches across England.
“As we saw last night in the swift and heroic action of the first responders… I pay tribute to the firefighters and all those involved.
