Singh, an SP-rank officer who has been coming to the NIA headquarters for last fortnight, was subjected to several rounds of questioning besides scientific tests including lie-detector test.
Searches at various places against him including his native place in Amritsar yielded nothing and documents recovered showed nothing incriminating against him, official sources said.
The NIA was trying to ascertain whether he had any role in the drug racket being run in the bordering districts of Pathankot and Gurudaspur.
The kidnappers released Singh and the cook but slit the throat of Verma before dumping him on the road and speeding away.
The terrorists carried out a 80-hour long terror strike at the IAF base from the intervening night of January 1 and 2 in which seven security personnel were killed. Four bodies of terrorists belonging to Jaish-e-Mohammed group were killed in the attack.
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