Inspite of Pakistan's denial, LeT operative David Headley has highlighted the deep involvement of ISI in the Mumbai attacks conspiracy by revealing how he received meticulous training in espionage from its officers and agents during hundreds of sessions. The training, imparted in a two-storey ISI safe house in Lahore, focussed on ways to camouflage his identity and earn the confidence of Indians he was going to use. Headley, a Pakistani-American in his testimony in a Chicago court said, he was imparted advanced training by Major Iqbal of ISI and several Non-Commissioned Officers NCOs of the spy agency. The instructions in spying were then given by Major Iqbal and NCOs from the ISI.