Indian businessman Prateek Gupta, who's being investigated in India for fraud, has been accused by Swiss firm Trafigura, one of the world's largest commodities traders, of cheating it of $600 million (about ₹5,400 crore). Trafigura claimed Gupta sold it scrap and steel instead of nickel. Gupta alleged that Trafigura officials asked him to boost nickel trading under a secret scheme.