On the heels of the Harry Winston robbery in Paris last week, the FBI may have thwarted a diamond heist in New York. Two Manhattan diamond-district businessmen and ten others were arrested by FBI agents last week for an alleged plan to hijack FedEx trucks loaded with millions of dollars' worth of diamonds. Authorities say Brian Greenwald, president of Doppelt & Greenwald Diamonds, and Roni Amrussi, of diamond wholesaler Davidov & Amrussi, aided an armed robbery of a FedEx truck in December 2007. Both are reportedly pleading not guilty today. [WWD]