France wildfires may have been caused by arson

In southeastern France, firefighting efforts have been ongoing to control wildfires. Evacuees have started returning to their homes and campsites, relieved but cautious. The fires have caused significant destruction, with eyewitnesses describing the scene as 'Dante's Inferno.' Authorities are investigating the cause, not ruling out arson, and are urging vigilance. Relief is felt as the worst seems over, but precautions remain in place.

What did the mayor pledge to investigate regarding the fires?

What was the general sentiment of the people who spent nights in makeshift shelters?