On Monday 20 July 2026 a major fire broke out near the Prairie de Mauves at chemin du Moulin-des-Marais in eastern Nantes, destroying about ten hectares of vegetation and part of nearby informal settlements.[1][2] About 150 firefighters evacuated residents; police who helped clear the camp discovered a cannabis plantation of roughly 150 to 200 plants, 20 Minutes reported, citing a police source.[1]

Officers left the plants in place while evacuation continued, Ouest-France said.[2] Once the fire was under control on Tuesday 21 July 2026, police returned and seized the plants that had not burned.[1][2] A judicial investigation was opened.[1]

The fire mobilised about 150 firefighters and led to the preventive evacuation of roughly 200 people, according to 20 Minutes; no casualties were reported.[1]