"[A] first fire alarm was triggered at 6:20 p.m. Monday, but that no fire was found after checks were carried out... A second alarm was triggered at 6:43 p.m...."

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"... and a fire was found under the roof in a network of wooden beams, many dating from the Middle Ages, that is nicknamed 'the forest.' [Rémy Heitz, the Paris prosecutor] said that investigators were working off the hypothesis that the fire was an accident."

The NYT reports. Also: "The cathedral’s rector, Msgr. Patrick Chauvet, told the radio station France Inter that the cathedral had fire monitors who checked the wooden framework under the roof three times a day."

I'd like to know more about what happened between 6:20 p.m. and 6:43. Is there some kind of slow, undetectable burning that could take place in "the forest" and become so well established that, at the point at which it could be found, it would be unstoppable? If there is such a thing, did the fire experts know it and necessarily accept it?
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