The Central Bureau of Investigation on Monday asked the Centre and the Maharashtra government to provide more security to officer investigating the Ishrat Jahan encounter case.
According to reports, investigating officer Sandeep Tamgadge, based in Nagpur, has received death threats in the past few days.
CBI director Ranjit Sinha has vowed to file chargesheet in the case by July 4.
As per reports, the CBI won't name Intelligence Bureau's special director, senior IPS officer Rajendra Kumar in its first chargesheet in the case.
There had been speculation that the CBI would name Rajendra Kumar for allegedly playing a role in generating the intelligence input that led to the alleged staged shootout.
Mumbai college girl Ishrat Jahan, Pranesh Gopinath Pillai, Amjad Ali and Jishan Johar were killed by Gujarat Police in a shootout in 2004 in Ahmedabad. Police said they were part of a plot to assassinate Chief Minister Narendra Modi.
The CBI has questioned Rajendra Kumar, who was with the IB in Gujarat when the incident took place.
The Bharatiya Janata Party (BJP), which rules Gujarat, contends that the Ishrat Jahan shootout was not "fake", and was conducted on the basis of information received from IB. It has also raised questions over the manner in which the CBI was probing the case.