Some 26 people were injured marchers from entering the Plaza Murillo CONISUR (Bolivia)
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Clashes broke out as protesters tried to approach the presidential palace
Hundreds of protesters have arrived in Bolivia's main city, La Paz, to demand the government resume the construction of a controversial road through an Amazon reserve.
President Evo Morales cancelled the project last year after a similar protest march by indigenous tribes.
They said the road would destroy their rainforest homeland.
But other communities say the highway would bring much-needed economic development to the Bolivian Amazon.
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Opposition groups say the march in favour of the road was instigated by supporters of President Morales.
Some of those marching are coca-growers from the Chapare region around Villa Tunari, where Mr Morales began his political career as a union leader.
They have been accused of backing the road project in the hope of occupying new lands in the Tipnis reserve to grow coca - the raw material for cocaine.