An arrest has been made in the incident outside the building where a dozen people were gunned down in 2015 in apparent retaliation for the publication of cartoons that satirized the Prophet Muhammad.
"We are in a period of epidemic growth," Prime Minister Jean Castex said. "We want to do everything to avoid a new lockdown." The order goes into effect Friday.
One museumgoer says it's a "much more comfortable experience" to view the Mona Lisa without the mobs of tourists. The Louvre put in place mask-wearing, one-way paths and other distancing measures.
Before France's lockdown began on March 17, around 100 workers were present at the site. Now only a security team guards the entrance. Work to clear debris was to have begun last month.
April 15 will mark the first anniversary of the fire that ripped through the cathedral. The Paris archbishop says he wants to send a "message of hope" through a small Good Friday service.
The strike took a quieter turn Friday, as protests ebbed but workers still stayed home in anger at a pension reform proposal. Stations and schools across the country remained shuttered.
Thousands of people march in the streets of Paris, Lyon, Marseille and other French cities, in a general strike that reflects anger both at Macron and his retirement plan.
Architects from around the world have flooded social media with their visions of a new Notre Dame. But 55% of French respondents say they want the cathedral to be just as it was before, a poll finds.
"Your police [steal] blankets from people that you force to live on the streets, while you raid protests and criminalize people that are standing up for rights of migrants," said Pia Klemp.
Environmental and labor groups complain the cleanup should have begun sooner, and they are concerned about health risks in Paris.