Nirav Modi

The CBI on Thursday sent fresh summonses to billionaire jeweller Nirav Modi and his uncle Mehul Choksi to join investigations as early as possible and made it clear to the duo that they were "obliged" to cooperate with the probe agency, officials said. The agency had sent three summonses on February 19, 23 and 28 asking them to join the probe at the earliest. They were asked to appear on March 7.