The CBI today asked Interpol for help to arrest celebrity jeweller Nirav Modi, who is being investigated for what is emerging as India's biggest bank fraud. Nirav Modi and his associates are accused of getting Punjab National Bank (PNB) officials to facilitate huge loans using fake guarantees, at the cost of Rs. 11,300 crore in public money. The passports of Nirav Modi and his business associate Mehul Choksi have been suspended and could be cancelled if they do not return to India within four weeks. As investigators seek his arrest, NDTV has traced the 48-year-old to a hotel in New York.