Der französische Innenminister Laurent Nunez lobte die Arbeit der Feuerwehrleute, die ihr Leben bei dem Großeinsatz riskierten. Die Rettung der Kathedrale sei auf einen entscheidenden Zeitrahmen von 15 bis 30 Minuten zurückzuführen, berichtete der Politiker.
When he left the building about 20 minutes later, Vexo said there was still no evidence of a fire, adding that he thought it was a false alarm.
Monsignor Patrick Chauvet, the rector of Notre Dame, told French radio station France Inter that the cathedral has fire supervisors who go up to the attic to examine the frame three times a day.
Paris public prosecutor Rémy Heitz announced on Tuesday that firefighters were called to the world-famous cathedral at 6.20pm CET, almost half an hour before the roof caught fire.
But after an initial inspection they said they were unable to find any evidence of fire.
Staff checked under the roof and saw nothing, according to a Paris judicial official, speaking anonymously.
But 23 minutes later a second smoke detector went off, at which point it was too late to stop the inferno.
„We are favouring the theory of an accident,“ he said, adding that 50 people were working on a „long“ and „complex“ probe into what caused the blaze.
He said they would be interviewing workers from five companies that had been hired to work on renovations to the cathedral’s roof, which was where the fire is thought to have started.