About 10 lakh employees and officers in public sector banks, private banks and regional rural banks are participating in the strike, All India Bank Employees Association General Secretary C H Venkatachalam said.
In Tamil Nadu and Puducherry about 60,000 employees are participating in the strike, he said.
All India Bank Employees Association, Bank Employees Federation of India, All India Bank Officers' Association and National Union of Bank Employees are taking part in the strike. All India Trade Union Congress has also extended its support for the strike.
"The Indian Banks' Association must shed its obstinacy. The Government must intervene. Otherwise United Forum of Bank Unions will be compelled to further intensify its agitation", he said.