Mumbai, July 3 -- In rising trouble for diamantaire Nirav Modi, the Singapore high court froze a bank account of his sister, Purvi Modi, and her husband, Maiank Mehta. A statement from Enfo-rcement Directorate (ED) on Tuesday said the court ordered freezing a balance of $6.122 million, or Rs.44.41 crore, as the deposits came from the amount Nirav Modi allegedly siphoned off from Punjab National Bank (PNB)....