Farmers protesting against new agricultural laws clashed with policemen this afternoon at Delhi-Jaipur highway when they were stopped from heading to the national capital to join thousands others camping on the outskirts of the city. About 20 of them were detained and over 200 farmers are now holding a sit-in, demanding their release. Dramatic visuals showed protesters on tractors blocking a part of the highway when cops tried to stop them. Policemen were seen climbing on tractors, snatching the vehicles' keys and negotiating with them as the security personnel made all possible efforts to clear the highway.