According to the news, who first discovered the fraud?

Police in India have arrested a Citibank employee accused of cheating clients out of millions of dollars.
    Shivraj Puri, 32, who is expected to appear in court later, told an Indian newspaper he was innocent.
    The alleged fraud was discovered earlier this month in a branch of the global bank in Gurgaon, a wealthy suburb of Delhi.
The bank has said investors were promised quick, high returns from a bogus financial scheme.
It is alleged that Mr. Puri transferred the money into accounts controlled by three relatives.
    Mr. Puri reportedly handed himself in on Thursday, a day after police said he was wanted for questioning.
    The alleged fraud came to light earlier this month when a client mentioned the scheme to a senior bank manager.