The trial suffered a major setback when chief prosecutor Chaudhry Zulfiqar Ali of the Federal Investigation Agency was gunned down by suspected militants in Islamabad on May 3.
Judge Chaudhry Habib-ur-Rehman of the Rawalpindi-based anti-terrorism court adjourned the case for a week without any proceedings during today's hearing.
The judge also reserved his decision on an application filed by the slain chief prosecutor to transfer the case to a court in Islamabad.
Paying tribute to the slain prosecutor, Ahmed said: "Chaudhry Zulifqar was a dedicated prosecutor and he was handling a number of high-profile cases professionally".
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He said Ali's assassination was a huge loss to the country.
Asked about the impact of the assassination on the case, Ahmed said: "Certainly, it will have an impact as Ali was conducting the case very well".
Another lawyer associated with the case told PTI that the incoming PML-N government was expected to appoint a new chief prosecutor to handle the Mumbai case.
The seven Pakistani suspects have been charged with planning, financing and executing the attacks that killed 166 people in Mumbai in November 2008.