Suspended Deputy Superintendent of Police (DSP) Devinder Singh and four other accused were on Thursday sent to 15 days National Investigation Agency (NIA) custody in an espionage case. He was arrested along with Hizbul Mujahideen commander Naveed Babu, his accomplice Rafi Ahmad and a lawyer named Irfan from a car on the highway near Kulgam, Jammu and Kashmir. He was allegedly helping Babu travel to Pakistan in connivance with Irfan.