State Election Commission sources said there was around 75 per cent turnout in the three districts of South 24 Parganas, North 24 Parganas and Howrah.
A youth, who was standing in queue to vote in South 24 Parganas, was shot dead by a member of the central force at about 8:30 PM when polling was still going on at the booth in Maya Hauli village under Jaynagar police station, police said.
Language problem could be the cause of the incident, they said, adding that the polling process stopped after that.
Sheikh Anwar Hossain (47) was beaten to death at Iyazpur under Deganga police station in North 24 Parganas district at about 10 PM, the police said.
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PCC president Pradip Bhattacharya claimed Hossain was a Congress worker who was murdered by CPI(M) activists.
Trinamool Congress supporter Sanat Ghosh was shot dead in Morapai under Usti police station in South 24 Parganas, Superintendent of Police Pravin Tripathi told PTI.
The CPI(M) claimed that Mullick was a party supporter.
At Ghutiarishariff in South 24 Parganas, the body of 16-year-old Somnath Mukhopadhay with wounds was recovered from a pond, Additional SP K Barui said.
He, however, said it might not be related to polls.