A court here on Monday allowed a National Investigation Agency (NIA) plea for a lie detector test on Punjab Police officer Salwinder Singh in connection with the attack at the air force base in Pathankot. Court sources said that during in-camera proceedings, district judge Amar Nath directed the NIA to conduct the polygraph test on Superintendent of Police Salwinder Singh within three days. The NIA earlier told the court that Singh's statements on his alleged abduction were inconsistent and the lie detector test was required to ascertain the truth. The NIA had questioned Singh as he was suspected of helping the terrorists who attacked the Pathankot air base on January 2. The police officer had claimed that he along with his friend Rajesh Verma and cook Madan Gopal was abducted by four or five heavily-armed terrorists near Kolia village in Punjab prior to the attack on the airbase. Seven security personnel were killed in the attack. All six terrorists suspected to have crossed over from Pakistan also were shot dead by the security forces in the counter-offensive.