Indian police on Tuesday used tear gas and detained some farmers who clashed with them and tried to break barricades blocking their way to New Delhi to demand guaranteed crop prices in a repeat of 2021 protests, when they camped on the capital’s outskirts for more than a year.

Police dropped tear gas canisters on the protesting farmers from a drone at one of the border points in northern Haryana state that leads to New Delhi, where tens of thousands of farmers are headed on tractors and trucks.

The demonstration comes more than two years after Prime Minister Narendra Modi withdrew controversial agriculture laws that had triggered the earlier protests, in which tens of thousands of farmers camped outside the capital through a harsh winter and a devastating COVID-19 surge.

The farmers, who began their march in northern Haryana and Punjab states, are asking for a guaranteed minimum support price for all farm produce. The government protects agricultural producers against any sharp fall in farm prices by announcing a minimum purchase price for certain essential crops at the beginning of the sowing season, taking into account the cost of production.

Farmers are also pressing the government to meet its promise to double their income and waive their loans. They say they will protest in New Delhi until their demands are met.