In a major development to the PNB fraud case, the Central Bureau of Investigation has asked Interpol to help locate billionaire jewellery designer Nirav Modi and his family. The Interpol has issued diffusion notice against billionaire jeweller Nirav Modi, his wife Ami Modi, brother Nishal Modi and his business partner and uncle Mehul Choksi. Nirav Modi, who holds an Indian passport, left India on January 1, while his brother Nishal, a Belgian citizen, departed from the country on same day. Meanwhile, a look out circular has been issued by enforcement agencies to all exit and entry ports to inform them about the movement of an accused.