They are protesting at a decision by the state government to release water from the Cauvery river basin to the neighbouring state of Tamil Nadu.

The farmers say the move, which follows a Supreme Court ruling, will jeopardise water supplies in Karnataka itself.

On Tuesday, a group of farmers attacked a legislator's house in Mandya district. Trains between Bangalore and Mysore are expected to be disrupted again on Wednesday, because of the unrest.

From the newsroom of the BBC World Service