The Rs 11,400 crore fraud in PNB came to light because of the government's pressure to clean up the banking system, Financial Services Secretary Rajiv Kumar said on Thursday after updating Finance Minister Arun Jaitley on the case.The alleged fraud, which has been going on since 2011, came to light only in January this year. On why the fraud went unnoticed for seven years, Kumar said it is a “systemic issue” and has to be looked into. Earlier in the day, the secretary said PNB will make the required provisioning and it has “sufficient” funds for it.