Security has been tightened in both Haryana and Punjab with personnel of the government railway police and the state police forces being deployed, officials said.
Earlier, Tharoor and the six journalists were booked by Noida Police for alleged sedition, among other charges, over the violence during the farmers' tractor rally in Delhi.
On the farm sector and the ongoing protest, Modi said, "MSP was there. MSP is there. MSP will remain in the future. Affordable ration for the poor will continue. Mandis will be modernised".
As per farmer unions, the 'chakka jam' includes blocking national and state highways between 12 noon and 3 pm to protest the internet ban in areas near their agitation sites.
Farmer unions had on Monday announced a countrywide 'chakka jam' on February 6 during which they would block national and state highways between 12 noon and 3 pm.
Protesting farmers owing allegiance to different farmers' bodies blocked state and national highways at several places on Saturday, causing inconvenience to commuters.
Congress MP Partap Singh Bajwa demanded setting up of a committee headed by a Supreme Court judge for an impartial probe into the January 26 incidents.
Rythu Vedikas would provide the much-needed platform for farmers to sit and discuss issues related to growing crops and price for farm produce, he said.