There was a possibility that some of the eyewitnesses could be brought to Delhi for some scientific tests including polygraph test (lie detector test), sources said.
As it recorded the statements of Superintendent of Police-rank officer Salwinder Singh and two others who were kidnapped by the terrorists, the NIA team visited the border village where the terrorists could have possibly entered and spoke to the villagers and BSF personnel.
A team of NIA, central agency created after Mumbai attack to probe terror-related cases, quizzed Salwinder Singh in Pathankot which showed there were some discrepancies in his statement which was being looked into, the sources said.

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The agency had taken Singh to the places he had visited before he, along with his jeweller friend Rajesh Kumar Verma and cook Madan Gopal, was kidnapped.
The NIA also recorded the statement of caretaker of the shrine who is believed to have told him that Madan Gopal and Verma had come during day time on December 31 only to return in the evening.

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