B K Prasad, a Tamil Nadu cadre IAS officer, has been given the task to complete the probe. Incidentally, he is due to retire from the service this month end.
The report will be submitted by this month end, official sources said today.
The panel, constituted on March 14 this year, following an uproar in Parliament, was asked to inquire into the circumstances in which the crucial files related to the case of Ishrat Jahan, who was killed in an alleged fake encounter in Gujarat in 2004, went missing.
Home Minister Rajnath Singh had disclosed in Parliament on March 10 that the files were missing.
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The papers which went missing from the Home Ministry include the copy of an affidavit vetted by the Attorney General and submitted in the Gujarat High Court in 2009 and the draft of the second affidavit on which changes were made, they said.
Two letters written by the then Home Secretary G K Pillai to the then Attorney General late G E Vahanvati and the copy of the draft affidavit have so far been untraceable, the sources said.
The second affidavit, claimed to have been drafted by the then Home Minister P Chidambaram, said there was no conclusive evidence to prove that Ishrat was a terrorist, the sources said.
Pillai had claimed that as Home Minister, Chidambaram had recalled the file a month after the original affidavit, which described Ishrat and her slain aides as LeT operatives, was filed in the court.
Ishrat, Javed Shaikh alias Pranesh Pillai, Amjadali Akbarali Rana and Zeeshan Johar were killed in an encounter with Gujarat Police on the outskirts of Ahmedabad on June 15, 2004.
The Gujarat Police had then said those killed in the encounters were LeT terrorists and had landed in Gujarat to kill the then Chief Minister Narendra Modi.