French police have fired tear gas at protesters at a large demonstration in the west of the country.
Ednews reports citing France 24 that thousands of people had gathered in Sainte-Soline to protest against plans for a new water reservoir.
Several police cars were set on fire after clashes broke out at the construction site.
The unrest follows weeks of anti-government demonstrations in Paris and other cities over President Emmanuel Macron's pension reforms.
Though unrelated to the protests over plans to raise the state pension age, the latest demonstration adds to the growing sense of public anger within France.
Opponents of the irrigation project in Sainte-Soline, near Poitiers, marched in large numbers on Saturday despite a ban on gatherings in the district.
The procession set off late morning, with at least 6,000 people taking part, according to local authorities, although organisers claim the group numbered 25,000.
They are protesting against one of the reservoirs being built in the Deux-Sèvres department - developed by a group of 400 farmers to reduce mains water usage in the summer.
France's worst drought on record last year intensified discussions over water resources. Supporters of artificial reservoirs say they could provide the solution to shortages during future dry spells.
But opponents say the project favours large agricultural producers for crop irrigation in the summer and would not directly help the local community.
"While the country is rising up to defend pensions, we will simultaneously stand up to defend water," said the organisers, gathering under the banner of "Bassines non merci" - "No to reservoirs, thank you".
More than 3,000 police officers were deployed to Sainte-Soline, while officials said at least 1,000 potentially violent activists had joined the demonstration.
Security forces fired tear gas to stop some who reportedly threw fireworks and projectiles as they approached the fenced-off construction area.
Officials say several people have been arrested and police have seized weapons, including pétanque balls and meat knives.
President Macron said: "We will never give in to this violence. In a democracy, we do not have the right to use violence."
Interior Minister Gérald Darmanin said violence displayed against officers in Sainte-Soline was "unspeakable" and "unbearable".
