Sixty per cent voters exercised their vote in West Bengal while 45 per cent voters cast their ballot in Odisha.
Polling is underway in 11 seats in Odisha, seven in Bihar, six in Jharkhand four in West Bengal and one in Manipur to decide the electoral fate of 366 candidates.
Polling was also being held for 77 Assembly seats in Odisha where 747 candidates, including 65 women, were contesting.
Maoists blew up railway lines in the district disrupting train services.
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A pressure cooker bomb was recovered near a polling booth in Maoist-hit Saranda forest, an hour before polling began in the Singhbhum (reserved) constituency, police said.
A Presiding Officer Bamia Soren was arrested for influencing people to vote for Independent nominee Geeta Koda, the wife of sitting MP and former Jharkhand Chief Minister Madhu Koda, Returning Officer of West Singhbhum, Abu Waqar Siddqui P said.
Forward Bloc secretary Udayan Guha said three Left parties' workers were injured and hospitalised.