Gurdaspur SP Salwinder Singh, who has been under the scanner since the Pathankot airbase attack, is likely to undergo a polygraph test after the National Investigation Agency (NIA) found inconsistency in his statement, said reports.

The NIA has summoned the police officer to its headquarters in Delhi after the agency was not satisfied with his narrative.

The probing agency found discrepencies in the statements given by Singh, his friend Rajesh Verma and cook Madan Gopal. Things became unclear as the SP was left unhurt by attackers.

Though Singh said he was a regular visitor to a Pathankot shrine, the shrine's caretaker said he met him for the first time on New Year's Eve. The agency is also probing why he took about two hours to cover 13 km while returning from the shrine to the area where he was allegedly abducted.

The NIA is also investigating why the police officer had a blue beacon atop his SUV as it was illegal, and why he did not wear his uniform or carry his service revolver.

The ongoing probe is being supervised by a 20-member team of the NIA. Cases hve been registered against unidentified persons under the Unlawful Activities Prevention Act and Arms Act.