The official said sanction was required by the CBI for any prosecution of the senior IB official.
PP Pande is an accused in the 2004 alleged fake encounter of Mumbai teenager Ishrat Jahan and three others.
GL Singhal was the ACP in 2004 during the fake encounter case of the 19-year-old college girl.
IPS officer GL Singhal filed a plea in the apex court saying the SIT should be reconstituted.
Ishrat Jahan was killed by Gujarat crime branch officials along with three others near Ahmedabad on June 15, 2004.
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