https://youtu.be/EgfYYMjpf1s

Description at YouTube:
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ola Andersson
Published on Apr 16, 2019

The fire that nearly consumed Notre Dame is horrible.

Someone noticed a flash on the roof of Notre Dame a while before the fire, from a webcam. I looked at the stored timelapses (each hour gets a one minute timelapse, one second is one minute) from the webcam and found a shadow (person?) moving on the roof and a flash.

Correction: The timelapse might not be a timelapse. Look at previous 1 min movies, the shaking of the cam seems like a timelapse, but later when the fire starts, the flames don't look like a timelapse. Don't know.

The clip is marked 15/04 17:05 on the webcam-site and the flash is at 23 sek with some movement a couple of seconds before. Meaning this (might be se correction above) is several minutes in real time.

There might have been a person doing something there about an hour before the fire started. The workers had a day off.

Another correction: The workers where working but closing up shop for the day.

I made this movie. Sorry for the quality.

Source: https://www.viewsurf.com/univers/ville/vue/10370-386973368-france-ile-de-france-paris-cathedrale-notre-dame
[note: the video used above has expired from that site.]
~~~~~~~~~~~~~~~~~~~~~~~~~

Found at this 8chan post:
https://8ch.net/qresearch/res/6213086.html#6213147

The 8chan post links to the following from DC Whispers:
~~~~~~~~~~~~~~~~~~~~~~~~~
The Video Authorities Don’t Want You To See: Mystery Person & Flash Of Light Before Notre Dame Cathedral Fire
Posted on April 17, 2019 by DCWhispers

If it had only been a singular incident involving a Catholic church in France the burning of one of the most well known human monuments to all of Christianity and Western Civilization could be understandably classified as an unfortunate accident during recent renovation work. Given that more than a thousand French churches across the country have been vandalized in recent years, though, more and more French (and others) are wondering if the Notre Dame fire wasn’t something far more sinister. Just released video of what appears to be someone moving inside the cathedral followed by a flash of light allegedly right before the fire started will do nothing to lessen those suspicions. If this was an act of vandalism and not an accident then hopefully the perpetrator(s) will soon be caught and brought to justice.

http://dcwhispers.com/the-video-authorities-dont-want-you-to-see-mystery-person-flash-of-light-before-notre-dame-cathedral-fire/
~~~~~~~~~~~~~~~~~~~~~~~~~