The NIA, after securing search warrants from a designated court here, carried searches at the residence of Singh, at present posted as Assistant Commandant of 75th Punjab Armed Police after being shunted out as Superintendent of Police (Headquarters), Gurdaspur.
Besides, his office-cum-residence was searched in Gurdaspur where the NIA team also searched the residences of his jeweller friend Rajesh Verma, a woman friend and the officer's cook Madan Gopal.
Singh was travelling with Gopal and Verma when their vehicle was hijacked by Jaish-e-Mohammed terrorist on the intervening night of December 31 and January one. Later Verma was left on the road with a slit throat, while the other two were let off after travelling a distance.
There was no clarity about the sequence of events that had happened on the night when the three were kidnapped and the officer's vehicle was hijacked, the sources said.
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The development came after interrogation of Singh by the NIA for several days in Delhi.
The NIA is questioning Singh to ascertain the sequence of events that took place after he was allegedly kidnapped on the intervening night of December 31 and January 1 by terrorists of Pakistan-based Jaish-e-Mohammed(JeM).
Singh came under the scanner after he said he and the cook were released after their abduction whereas his friend Rajesh Verma, who was travelling with them, was left bleeding midway by the terrorists.
Also, his claim that the incident occurred when he was returning from a shrine, which he often visited, was found to be allegedly incorrect after NIA questioned the caretaker of the dargah, Somraj, who told the anti-terror probe agency that the police officer had visited the place that day for the first time.
Bodies of four terrorists were recovered, while two others were believed to have been blown up.