ED officers inspect documents after seizing cash, jewellery and bonds worth crores during a raid in Thane late on Monday. Pic/PTI

The Nirav Modi scam at Punjab National Bank (PNB) was going on since 2008, according to a set of incriminating documents the Central Bureau of Investigation (CBI) has found in its searches. Officers said many senior officials could be involved and that the scam was much bigger than it appeared to be. As per CBI officers, some of the accused and others who were questioned had claimed that the documents were not available at PNB's branch in Brady House, Fort, which is at the centre of the R11,400-crore money-laundering probe.