12 persons were arrested there, Gupta said. Special Election Observer for the state Sudhir Kumar Rakesh visited the troubled spot.
A report was sought from the district magistrate.
Three persons were seriously injured in Keshpur under Ghatal Lok Sabha constituency in a clash between CPI-M and TMC, Gupta said.
He said barring stray incidents, polling was peaceful with deployment of forces including central forces.
Gupta said the presiding officer of a polling booth at Jibantala under Joynagar constituency was removed as a TMC worker was seen giving proxy votes. Police were directed to file an FIR against him.
Two bombs were allegedly thrown by unidentified persons at the car of former Kolkata deputy mayor Mina Devi at Bowbazar in Kolkata when she was crossing the area. None was injured.
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