The NSG today issued a statement saying the inquiry will ascertain the sequence that led to the reception and subsequent
transfer of the communication line to its officer based in Hyderabad.
The 'black cat' commandos force said that preliminary probe concluded that no vital information was shared with the spy.
"A Court of Inquiry has been ordered by Director General of NSG to go in to the details about the circumstances under which the calls were connected to the officers of the Regional Hub, Hyderabad and the information passed to the unauthorised person," a statement from the National Security Guard (NSG) headquarters here said.
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"It has come to the notice of the NSG that an unauthorised person, claiming to be Major Ajay Sharma from MI-3, tried to contact the NSG Palam exchange on February 21, 2013. The call was further redirected to Regional Hub of NSG at Hyderabad.
"During the course of the conversation, the officer who was on duty, has given some details about the deployment of the NSG team from Regional Hub Hyderabad at the blast site at Hyderabad on February 21," the NSG statement said.
"Preliminary probe has revealed that no details about the blast or the post blast investigation has been given to the caller," it added.