A year ago, Sainte-Soline, a small town in Deux-Sèvres, was the scene of clashes between environmental protesters and the police. The crux of the matter: an artificial water retention site called a “mega-basin” and highly criticized.

Activists are holding memorial rallies this weekend. 500 people expected this Saturday in Melle, a neighboring town, where around 500 people are expected for a large picnic. The Rennes public prosecutor's office, in charge of the investigation, has interviewed around a hundred witnesses.