The INDIA bloc appears to be on the brink of unravelling as a third key leader, Bihar Chief Minister Nitish Kumar, appears likely to walk out. Sources said it is likely that Mr Kumar, in a last-minute U-turn, will partner the BJP in the coming Lok Sabha elections. Over the last two days, two key leaders -- Mamata Banerjee and Arvind Kejriwal -- have all but cut ties with INDIA bloc, ruling out any alliance with the Congress and saying they would go solo in Bengal and Punjab. Mr Kumar -- who, sources said, may even share stage with Prime Minister Narendra Modi at his February 4 rally in Bettiah -- has called all his MLAs to Patna.