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.

"BSF will not be able to secure the border till it is fenced. To install fences, BSF will require land. I wrote seven letters to Mamata Banerjee. In the last six years, the Union home secretary came down (to Kolkata) to mee...