The military buildup was initiated by India responding to a terrorist attack on the Indian Parliament on 13 December 2001 ( during which twelve people , including the five terrorists who attacked the building , were killed ) and the Jammu and Kashmir Legislative Assembly on 1 October 2001 . India claimed that the attacks were carried out by two Pakistan-based terror groups fighting Indian administered Kashmir , the Lashkar-e-Taiba and Jaish-e-Mohammad , both of whom India has said are backed by Pakistan 's ISI – a charge that Pakistan denied
a terrorist attack
2001 Indian Parliament attack
2001–02 India–Pakistan standoff