By Isabella Nikolic For Mailonline
Published: 20:34 BST, 15 April 2019 | Updated: 21:00 BST, 15 April 2019
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Authorities have revealed they are unable to drop water on to Notre Dame to tame the blaze for fear it will ruin what is left of the 850-year-old cathedral as well as injuring people nearby.
The tactic was suggested by US President Donald Trump on Twitter but it hasn't been deployed because of the risks it could pose not only to the historic building but to any people nearby.
The French Interior Ministry tweeted to say that 400 firefighters have been mobilised to help tackle the blaze that is engulfing the cathedral.
In cases of intense fires, a water bomber jet - called a Canadair - can be deployed to drop large amounts of water.
A blaze has engulfed Notre Dame cathedral in Paris since earlier this afternoon. French authorities have revealed why they won't be using a water-bomber jet to drop water over the building
The French Interior Ministry has tweeted to say 400 firefighters have been mobilised to help tackle the blaze
