Addressing an election rally here, she accused the BJP of being involved in the conspiracy as the saffron party cannot match the ruling Trinamool Congress'' campaigning on development programmes.
Addressing a public meeting here in Hooghly district, Banerjee alleged central forces are working on instructions of the Union Home Ministry run by Amit Shah.
Voting is underway with strict adherence to COVID-19 protocols in nine seats each in Purba and Paschim Medinipur districts, eight in Bankura and four in South 24 Parganas.
She became the chief minister of West Bengal in 2011 by ending the 34-year-long CPI(M) regime, one of the longest-serving elected governments in the world.
While 34.1 per cent of the respondents said the BJP will benefit and 12.2 per cent said the Left-Congress will gain after the incident.
The use of the Prime minister's photograph in such hoardings violates the Model Code of Conduct (MCC), the official of the West Bengal Chief Electoral Officer (CEO) said.