Braving rains, Congress supporters joined the rally christened as "Kandhamal Adhikar Yatra" to protest alleged inaction of the state government in the tragedy that took place at Gumudumaha on July 8.
The padayatra is scheduled to conclude on August 13 at Balliguda with a day-long demonstration.
Inaugurating the yatra at Gumudumaha, state Congress president Prasad Harichandan accused the BJD government of failing to take any concrete action against the culprits though one month has elapsed since the killing took place.
He charged the Neveen Patnaik government with working against the interest of the tribal people.
Harichandan also alleged that the state government has failed on all fronts and is making false claims about bringing development in the state.
The padyatra organised by the party is aimed at making people aware of the "misrule and misgovernance" during the BJD Government, he said.