However, private sector banks like ICICI Bank were working as usual.
Most of the public sector banks including SBI had earlier informed their customers of inconvenience if strike materialises.
The United Forum of Banks Unions (UFBU), an umbrella organisation of nine bank employees and officers unions representing 8 lakh staffers, has gone ahead with the strike, affecting services like cheque clearances, cash deposit and withdrawal at branches and other facilities.
According to the All India Bank Employees Association (AIBEA) General Secretary, C H Venkatachalam, normal operations at branches across all PSU banks were affected.
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The conciliation meeting with the Chief Labour Commissioner on July 26 did not yield any positive results.
However, UFBU is willing to reconsider the strike call if the government considers their demand and addresses it.
Unions, which are protesting FDI in banking sector, are pressing for various demands, which include one not to privatise public sector banks and increase private capital in such banks, he said.