Smoke and flames rise from a fire in the street near a masked protester during clashes with French riot police at a march in Nantes, western France
Smoke and flames rise in the street during clashes with French riot police at a march in Nantes, western France Reuters

Six police officers were injured in outbreaks of violence in the French city of Nantes on Saturday, as 20,000 people demonstrated against an airport project.

Riot police clashed with thousands of protesters, who broke shop windows, destroyed bus stops and broke up paving stones to hurl at officers.

A protester is kicked by a French riot policeman during clashes
A protester is kicked by a French riot policeman during clashes Reuters

The protesters included farmers, locals and environmental activists who say the new airport near Nantes will damage the environment and be an expensive white elephant.

Riot police used tear gas and water cannon to disperse protesters who lobbed projectiles and paint on to Nantes city hall, set fire to construction vehicles and vandalised the offices of Vinci, the project's contractor.

Masked protesters are sprayed by a water canon
Masked protesters are sprayed by a water cannon Reuters

"I regret that this demonstration transformed itself into a genuine urban guerrilla war, escaping the organisers' control," French Interior Minister Manuel Valls told AP.

He claimed the protesters were from the "radicalised ultra-left" and were waging an "urban guerrilla" campaign.

A tear gas grenade explodes near a masked protester
A tear gas grenade explodes near a masked protester Reuters

"These are individuals who are very violent." Valls said on iTele TV station.

The anti-airport protests have brought together an unlikely alliance of farmers, ecologists and anarchists — who call themselves ZADists, based on the French acronym for "development zone". Farmers trying to save their land have depended on the ZADists to keep their protest alive.

French riot police under attack from paint lobby by environmental activists
French riot police under attack from paint lobbed by environmental activists Reuters

Police say they arrested four protesters and claim the more mainstream protest organisers were "overwhelmed by the radical fringe they've relied on from the start".

Environmental activists have been protesting for more than a year against the government's plan to build a new airport for the west of the country, with some activists occupying the area by living rough in makeshift wooden huts.

Farmers, ecologists and anarchists join together in a protest against the new French airport. The sign reads, "Airport, No Thanks".
The protest against the new Nantes airport. The sign reads, "Airport, No Thanks". The odd spelling is a pun on the surname of the Prime Minister of France, Jean-Marc Ayrault, who was previously mayor of Nantes. Reuters

Police have unsuccessfully tried several times to evict the squatters and have had to contain many demonstrations.

The €580 million airport is scheduled to open in 2017.

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