Kolkata, March 17 -- The Election Commission of India (ECI) on Monday transferred four top Indian Police Service (IPS) officers in West Bengal, including state's Director General of Police (DGP) Peeyush Pandey and Kolkata commissioner of police Supratim Sarkar, with the move triggering a political slugfest in the eastern state ahead of the assembly polls. The development comes a day after ECI announced the poll schedule for West Bengal, which will go to polls in two phases on April 23 and April 29, and hours after the commission ordered the removal of the state's two top bureaucrats, chief secretary Nandini Chakravorty and home secretary Jagdish Prasad Meena. ECI said its directions are to be implemented with immediate effect. The poll panel on Sunday night appointed 1993-batch IAS officer Dushyant Nariala as the West Bengal's chief secretary, and 1997-batch IAS officer Sanghamitra Ghosh as home secretary. In its order transferring the state's top police officers, ECI appointed 1992-batch IPS officer Siddh Nath Gupta as the DGP, and brought in Ajay Kumar Nand, 1996-batch IPS officer, as the new commissioner of Kolkata Police. The ECI also replaced ADG (law and order) Vineet Goyal with 1995-batch IPS officer Ajay Mukund Ranade and appointed Natarajan Ramesh Babu, a 1991-batch IPS officer, as director general (correctional services), in place of Siddh Nath Gupta....