The Indian leadership under Prime Minister Gandhi quickly decided that it was more effective to end the genocide by taking armed action against Pakistan than to simply give refuge to those who made it across to refugee camps. Exiled East Pakistan army officers and members of the Indian Intelligence immediately started using these camps for recruitment and training of Mukti Bahini guerrillas. The Pakistan Air Force (PAF) launched a pre-emptive strike on Indian Air Force bases on 3 December 1971. The attack was modelled on the Israeli Air Force's Operation Focus during the Six-Day War, and intended to neutralise the Indian Air Force planes on the ground. The strike was seen by India as an open act of unprovoked aggression. This marked the official start of the Indo-Pakistani War.