Kolkata, Dec. 31 -- Union home minister Amit Shah on Tuesday launched a scathing attack on the Trinamool Congress government in West Bengal over infiltration, alleging that the demography of the state was changing dangerously and asserting that the Bharatiya Janata Party will win a two-thirds majority in next year's assembly polls. Hours later, chief minister Mamata Banerjee hit back, blaming the Centre for terrorism and infiltration and demanding Shah's resignation over the special intensive revision of voter rolls. "Where do the infiltrators go after crossing the border? Who is helping them to make the documents? The West Bengal government is making the documents. When illegal immigrants are arrested from across the country, fake document...