Amristar, Jan 21 (ANI): The National Investigating Agency (NIA) team on Thursday reached suspended Gurdaspur Superintendent of Police (SP) Salvinder Singh’s residence to further investigate the Pathankot airbase attack. Earlier, Salvinder had undergone a lie detector test at the NIA office in New Delhi. Salvinder has been allegedly accused of helping the terrorists to carry out the Pathankot airbase attack.