The fire which destroyed the historic organ of Nantes Cathedral, France, 18th July, was arson. A Rwandan national, who had been ordered to leave the country in 2019, and who was regularly doing voluntary work for the Church, is reported to have admitted starting the fire, apparently using fuel in several places. The fire destroyed the historic cathedral organ, stained glass windows and a C19° painting. The Cathedral’s roof did not catch fire because it had been rebuilt in concrete in 1972 when the Cathedral also faced a major fire.
Nantes cathedral fire https://www.liberation.fr/france/2020/07/26/incendie-de-la-cathedrale-de-nantes-le-suspect-numero-1-avoue_1795280 and https://www.lemonde.fr/idees/article/2020/07/21/l-incendie-de-la-cathedrale-de-nantes-sonne-comme-un-avertissement-pour-la-restauration-de-notre-dame_6046784_3232.html