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In this photo taken on Wednesday, April 17, 2019, Britain's Houses of Parliament, covered in hoarding and scaffolding as it undergoes restoration work to repair the crumbling building, in London. For some Britons who watched Notre Dame in Paris burn, horror was mixed with apprehension. What happened to the French landmark this week could befall the Houses of Parliament tomorrow. The seat of Britain's government is crumbling, leaky, infested with rodents, and a fire trap. (AP Photo/Kirsty Wigglesworth)

In this combination of photos, flames and smoke rise as the spire on the Notre Dame Cathedral collapses during a fire in Paris, Monday, April 15, 2019. (AP Photo/Diana Ayanna)

A worker checks on a wooden support structure placed on the Notre Dame Cathedral in Paris, Wednesday, April 17, 2019. Nearly $1 billion has already poured in from ordinary worshippers and high-powered magnates around the world to restore Notre Dame Cathedral in Paris after a massive fire. (AP Photo/Francois Mori)

Police begin to remove climate activists who glued themselves on top of a Dockland Light Railway train at Canary Wharf station in east London as part of the ongoing climate change protests in the capital on Wednesday April 17, 2019. The group Extinction Rebellion is calling for a week of civil disobedience against what it says is the failure to tackle the causes of climate change. (Kirsty O'Connor/PA via AP)

People attend a vigil in Paris, Tuesday April 16, 2019. Firefighters declared success Tuesday in a more than 12-hour battle to extinguish an inferno engulfing Paris' iconic Notre Dame cathedral that claimed its spire and roof, but spared its bell towers and the purported Crown of Christ. (AP Photo/Michel Euler)

FILE - In this Aug. 19, 2009 file photo, children run down Lombard Street in San Francisco, transformed for the day into a gigantic Candy Land board game to commemorate the game's 60th anniversary. Tourists may soon have to pay a fee to drive down San Francisco's world-famous crooked street. California officials plan to announce a proposal Monday, April 15, 2019 that would grant San Francisco permission to establish a toll and reservation system. (AP Photo/Marcio Jose Sanchez, File)

People pray as Notre Dame cathedral burns in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (AP Photo/Christophe Ena)

Firefighters tackle the blaze as flames and smoke rise from Notre Dame cathedral as it burns in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (AP Photo/Michel Euler)

Flames and smoke rise from Notre Dame cathedral as it burns in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (AP Photo/Thibault Camus)