The agency is also concentrating to conclusively prove the identity of four terrorists, whose bodies were secured from the attack site as it got a Black Notice issued from Interpol. The international notice is issued for identification of unidentified bodies found in a country, an MHA spokesperson said.
The NIA has also sent some body parts to CFSL to ascertain whether they belong to the remaining two terrorists who were involved in the 80-hour-long gun battle with security forces which left seven personnel dead, the sources said.
Agency sources have not ruled out subjecting him to lie detector test as questioning will continue tomorrow when his cook Madan Gopal will also be examined by the terror investigation agency.
The sources claimed Gopal might be confronted with Singh who is still not giving clear answers to several key questions regarding his alleged abduction by attackers of the IAF base.
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Singh, who is at present a Superintendent of Police-rank officer posted as Assistant Commandant of 75th battalion of Punjab Armed Police after he was removed as SP (headquarters) Gurdaspur, had allegedly given contradictory statements about his kidnapping and sequences of events preceding and succeeding the hostage event, official sources said.
The NIA has recorded statement of the caretaker of the shrine which Singh had said that he had visited with Gopal and his jeweller friend Rajesh Verma, who was left bleeding with a cut below his throat by the terrorists after abducting the other two.
NIA had recored Singh's statement in Pathankot but he has been asked to come on January 13 as his statements were also contradictory in nature, the sources said.
A 10-member NIA team continuing search operation in Punjab has already recovered AK-47 magazine, mobile phone and binoculars from IAF base in Pathankot, the spokesperson said.