A water dispute between the states of Karnataka and Tamil Nadu has spurred Karnataka farmers to block the busy main highway between Bangalore and Mysore and storm nearby reservoirs to prevent the release of water. The farmers are protesting a court ruling that would force Karnataka to release water from the River Cauvery downstream to Tamil Nadu, a ruling that was mitigated by the Indian prime minister. The river flows through both states, but the control of its water has been in dispute for years. In 1991 a similar ruling sparked major anti-Tamil rioting in Karnataka, and government officials are concerned that this ruling could spur further unrest.