The agency told the court that they would inform it about the process of serving summons to the foreign nationals, Gerosa Carlo Valentino Ferdinand and Haschke Guido Ralph.
"Complainant (ED's officer) said that he shall verify the present process for serving A-3 (Gerosa) and A-4 (Haschke) as they are foreign nationals," Special CBI Judge V K Gupta said.
Gautam Khaitan, who was the only accused arrested in the case, was earlier granted bail by the court.
During the proceedings today, Ritu Khaitan moved a bail plea and the court fixed it for arguments on February 2.
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"Put up for February 2 for reply and arguments on the bail plea of A-2 (Ritu), furnishing of procedure of process to A-3 and A-4...," the judge said.
Gautam Khaitan was the first person to be arrested in September last year by ED in the chopper deal case in which CBI is also running a parallel probe.