The CBI filed a supplementary charge sheet in the $2 billion Punjab National Bank (PNB) scam, naming fugitive diamond merchant Nirav Modi's brother Nehal and four others as accused. Besides Nirav Modi, the charge sheet named his brother Nehal Modi suspended deputy general manager at PNB Sanjay Prasad, and Nirav Modi's associates Amit Magia, Sandeep Mistri and Mihir Bhansali, according to the source.