Protesting farmers observe nationwide 'Chakka Jam' for three hours, epicentre in Punjab, Rajasthan, Haryana; protestors detained in Karnataka; Internet to remain shut in Delhi's Singhu, Tikri and Ghazipur borders till Saturday midnight; West Bengal: BJP chief JP Nadda flags off statewide 'Parivartan Yatra', attacks CM Mamata Banerjee and more..