During the primary two hours, round 16.32 and 17.51 per cent voting was recorded in Samserganj and Jangipur seats in Murshidabad district, they mentioned.
Polling started at 7 am amid tight safety.
A complete of 6,97,164 voters are eligible to train their franchise within the three constituencies.
Votes might be counted on October 3.
Banerjee, who misplaced from the Nandigram constituency within the meeting elections earlier this yr, has to win this by-poll to retain the chief minister’s put up.
Polls needed to be countermanded in Jangipur and Samserganj in April following the demise of two candidates.
Long queues had been seen since early morning exterior a number of cubicles throughout the constituencies. Voting will proceed until 6 pm.
Banerjee, who can also be the Trinamool Congress supremo, is pitted towards BJP’s Priyanka Tibrewal and CPI(M)’s Srijib Biswas in Bhabanipur.