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Special Judge O P Saini extended the protection after senior advocate A M Singhvi, appearing for the Chidambarams, made a request in this regard.
The request was made after Solicitor General Tushar Mehta, appearing for the agencies, sought more time to complete the probe.
The case relates to alleged irregularities in grant of Foreign Investment Promotion Board (FIPB) approval in the Aircel-Maxis deal.