Farmer leaders, who participated in a meeting with Union ministers on December 3, declined food offered by the government.
They were seen distributing and eating food they had taken with themselves on paper plates.
The fourth round of talks was held at Delhi's Vigyan Bhawan, as protesting farmers camp at the national capital's borders.
They want 3 recent agri-reform laws scrapped, along with legally guaranteed minimum support price.
Union agriculture minister Narendra Tomar and Union commerce minister Piyush Goyal led the talks with the farmers.
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