New Delhi: Three weeks after the attack on Pathankot airbase, the National Investigation Agency’s (NIA) investigation is going on with double the force.

The investigating agency is likely to move court for conducting lie detector test on Gurdaspur Superintendent of Police Salwinder Singh.

Singh was questioned for the fifth consecutive day last week at the NIA headquarters in Delhi following his alleged kidnap by terrorists before the Pathankot terror attack.

Earlier, the NIA sources had said that several discrepancies have been found in the versions of Singh, his jeweler-friend Rajesh Verma and cook Madan Gopal.

Salwinder Singh had claimed that he, along with his cook and a friend, were abducted by terrorists on his way back from Panj Pir shrine.

Singh, along with his jeweller friend Rajesh Verma and cook Madan Gopal, were allegedly kidnapped by terrorists on December 31. The terrorists entered the Pathankot air base late night on January 1 and carried out a terror strike in which seven security personnel including a Lt Colonel of NSG were killed.