Amid allegations of money laundering against banks and insurance companies by an online portal, Reserve Bank of India governor D Subbarao today said it was the responsibility of the government and tax authorities to check such activities.

"RBI is not directly involved... even banks are not directly responsible. They are not expected to inquire about the source of income. It is for government and tax authorities to check money laundering," he said while addressing students and academicians as part of the Platinum Jubilee celebrations of Jammu & Kashmir Bank.

The RBI chief further said there was no conclusive evidence of money laundering in the expose of Cobrapost, the portal which has alleged wrong doing on the part of 23 public and private sector banks and insurance companies.

On challenges before the Reserve Bank of India (RBI), he said the biggest one was bringing down inflation without hurting growth. The central bank has recently reduced short-term lending rate by 0.25 per cent to promote growth, but the industry was not satisfied.

Mr Subbarao also said that the central bank was planning to introduce plastic currency notes soon.

The RBI and government had earlier decided to introduce one billion pieces of Rs. 10 notes in polymer/plastic on a field trial basis in Kochi, Mysore, Jaipur, Bhubaneswar and Shimla.

It was being done to elongate the life of bank notes, especially the ones with lower denominations.

Referring to Islamic banking, Mr Subbarao said that the concept in not consistent with Indian banking regulations.