Besides talking to an official of the National Security Guard, a Pakistani ISI agent called up two Hyderabad police officials on February 21, the day the twin blasts took place in the city.
But the officials did not pick the calls from the ISI agent identified as Tasleem.
Tasleem spoke to a major rank officer of the NSG on the night of the blast to know about the movement of forces in Hyderabad.
He tricked the NSG official by masquerading as an Indian army official.
The NSG has ordered a probe to look into a suspect call that was transferred to one of its official from its main board.