Campaigning has intensified in West Bengal ahead of Phase 1 voting on April 23, with top leaders criss-crossing the state. Amit Shah, campaigning in North Bengal, launched a sharp attack on Mamata Banerjee, accusing the Trinamool Congress of injustice. Meanwhile, in a significant development, a key campaign partner has shut offices for 20 days citing legal issues. TMC has alleged possible action by central agencies in the final stretch, raising political tensions ahead of polling.