New Delhi, May 5 -- National Investigation Agency (NIA) sleuths are questioning Pakistan-born Canadian citizen Tahawwur Hussain Rana - the 26/11 Mumbai terror attacks mastermind - about the Karachi and Nepal set-ups of the Inter-Services Intelligence (ISI) and Lashkar-e-Taiba (LeT) and trying to extract details about top Pakistani intelligence officials who held profound influence over the top brass of the Hafiz Saeed-led terror outfit, officials familiar with the matter said. Rana's childhood friend and co-accused David Coleman Headley had disclosed about the Karachi set-up and the Nepal set-up to the NIA sleuths when a team travelled to the US and questioned him in June 2010. "Headley had mentioned a Karachi set-up and a Nepal set-up run by Major Abdul Rehman Hashim Syed alias Pasha (key accused and handler in the 26/11 attacks case). The Karachi set-up, according to him, had local Indian boys for carrying out attacks and it had complete backing of ISI. Similarly, LeT also had a Karachi set-up, which was controlled by Sajid Mir (main ISI handler linked to the case) and had Maharashtra and Gujarat based boys," said an officer, who asked not to be named. "We are interrogating him (Rana) about these set-ups," he added....