Hundreds of people from the Suku Tanjung indigenous group hurled rocks at the office of the district head in Agam, West Sumatra, on Thursday to protest the lack of resolution to a long-running land dispute.

Edlerman, a tribal elder, said the Suku Tanjung wanted the district head and officials from plantation company Mutiara Agam to meet with them to discuss the fate of 2,500 hectares of land granted in a concession to the company. The tribe claims the land is ancestral forest and thus not to be exploited.

The protest turned violent when the protesters broke through a security cordon. After breaching the cordon, they threw rocks and other objects at the district head's office, shattering several windows.