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.
According to Congress leaders, four cars bumped into each other on National Highway-9 in Hapur district while the convoy was moving towards Rampur, though no one was injured.
The reward of Rs 1 lakh was announced on Sidhu, Jugraj Singh, Gurjot Singh and Gurjant Singh who hoisted flags at the Red Fort or involved in the act, according to police.
Earlier, Tharoor and six journalists were booked by the Noida Police for sedition, among other charges, over the violence during the farmers' tractor rally in Delhi.
The development comes in the wake of violence in Delhi on Republic Day on January 26 during a tractor parade of farmers protesting the new agriculture laws.
Prime Minister Narendra Modi had Saturday said his government's offer on agri laws made to protesting farmers “still stands” and it was a just “phone call away” for talks.
The prime minister's remarks come amid ongoing protests by thousands of farmers, mostly from Haryana, Punjab and Uttar Pradesh, at several border points in Delhi.
The SKM has blamed the KMSC, actor-turned-activist Deep Sidhu and the central government for the violence during the farmers' tractor parade in Delhi on January 26.
Around 500 protesters stayed put at the UP Gate with more pouring in from western Uttar Pradesh in the night on the call of the BKU, an influential farmers' union in north India.