Violence and deaths have marked the five-phase panchayat elections in the politically-volatile state, ruled by Trinamool Congress chief Mamata Banerjee, since the voting began on July 11.
On Friday, three people died during the third phase of elections in Howrah, North 24 Parganas and South 24 Parganas districts.
Over 37,500 candidates are in the fray, with the main contest likely to be between the Trinamool Congress and the opposition Left Front led by the Communist Party of India-Marxist.
Besides 50,000 security personnel, comprising 15,000 central paratroopers and the rest from the state armed police force, the central government has dispatched 4500 additional reinforcements.
The first three phases were held on July 11, 15 and 19. Polling for the next two rounds will be on July 22 and 25. Votes will be counted on July 29.
