Aboriginal Indians in Colombia's Cauca State are determined to press their claim to what they say are ancestral lands.
Riot police have been deployed around the town of Caloto where farms were invaded.
Indian protesters and police clashed at one ranch as the government ordered their eviction.
A riot erupted in which a police vehicle was set alight as protesters hurled stones.
One young man was killed, reportedly hit in the eye by shrapnel from a tear gas round.
Indians remained defiant after the clash and reportedly went on to invade other farms.