A group of masked men have attacked a government building in the outskirts of Moscow in protest at plans to build a highway through a local forest.
Some 100 protesters threw Molotov cocktails and fireworks at the city hall in Khimki and chanted “Save Russia’s forests.”
No-one was arrested at the scene but police later arrested nine environmentalists living in the trees.
The planned Moscow-St Petersburg tollway will wind through Khimki forest in a bid to cut congestion.
Authorities say an improved road network will be a boost to the economy.
Russia’s Supreme Court has ruled that the decision to build the road is legal.
It is set to open in 2015.