Bolivian police have forcibly broken up a march by indigenous activists protesting against plans to build a road they say will despoil a vast Amazon nature reserve.
Erbol radio said police used tear gas against the marchers and arrested their leaders, hauling protesters away in buses.
About 1,000 marchers departed the eastern lowlands provincial capital of Trinidad in mid-August and were nearing La Paz, the capital.
The crackdown came a day after protesters armed with bows and arrows briefly detained foreign minister David Choquehuanca, forcing him to march with them.
President Evo Morales has alienated many core supporters by insisting on the 240-mile Brazil-financed road.