The timing very nearly produced a catastrophe of far greater proportions. Had the attack come before the adjournment, some of India's most senior political figures would have been trapped in the building with hundreds of others. As it was, the gunmen rammed their car into the Vice President's vehicle, leaped out, and opened fire. Security personnel and Delhi Police responded immediately, returning fire and sealing the compound gates. Six Delhi Police officers died in the exchange. Two Parliament Security Service personnel were killed. A gardener, caught in the crossfire, also lost his life. All five attackers were shot dead. The grenades they carried did not detonate. The explosives in the car failed to go off. Had they functioned, the death toll could have been dramatically higher.

Indian authorities identified the five attackers as members of Jaish-e-Mohammed, a Pakistan-based militant group. Delhi Police said the operation had been carried out under the guidance of Pakistan's Inter-Services Intelligence. One of the attackers had previously participated in the hijacking of Indian Airlines Flight 814 in 1999. India also accused Lashkar-e-Taiba of involvement, though that organization denied it. The accusations carried enormous weight. Within a week, India issued a demarche to Pakistan's High Commissioner, demanding the dismantling of both organizations. Pakistan placed its forces on high alert. By December 20, India had mobilized troops to the borders of Kashmir and Punjab in its largest military deployment since the 1971 Indo-Pakistani War. Two countries with nuclear arsenals stood at the edge of conflict.

The legal aftermath stretched over more than a decade and exposed deep fractures in Indian society. Four people were arrested and tried: Afzal Guru, S.A.R. Geelani, Shaukat Hussain, and Shaukat's wife Navjot Sandhu. The trial, presided over by Judge S.N. Dhingra, concluded in six months -- remarkably fast for an Indian court. Eighty prosecution witnesses testified. Three hundred documents were entered into evidence. Geelani, a young lecturer at Delhi University who had been presented as the mastermind, was ultimately acquitted, his colleagues having rallied to his defense and secured the prominent lawyer Nandita Haksar for his case. His acquittal undermined key elements of the prosecution's narrative. Navjot Sandhu was convicted only on a lesser charge and sentenced to five years.

Afzal Guru's death sentence became one of the most contested legal cases in modern Indian history. Scheduled for execution in October 2006, he received a stay. His family traveled to Delhi to petition President A.P.J. Abdul Kalam for mercy. The families of the security personnel killed in the attack responded by returning the Ashok Chakra medals the government had awarded their loved ones, saying the honors were meaningless if the convicted man was spared. Kalam declined to intervene. The case remained in limbo for years until February 2013, when President Pranab Mukherjee rejected the mercy petition. Guru was hanged at Tihar Jail on February 9, 2013, and buried within the prison grounds. His execution, carried out without prior notice to his family, sparked protests across Kashmir and reignited debates about due process and the politicization of justice.

The Parliament House complex, designed by Edwin Lutyens and Herbert Baker and completed in 1927, sits at the ceremonial heart of New Delhi along Sansad Marg. Its circular colonnaded structure, visible from the air as a distinctive ring amid the grid of Lutyens' Delhi, was built to house the legislative assembly of British India. Today it stands as the seat of the world's largest democracy. The 2001 attack left bullet scars on its sandstone facades and permanently transformed its security architecture. Concrete barriers, metal detectors, and multiple security perimeters now surround a building that was once relatively accessible. Each December 13, the Parliament observes the anniversary, honoring the nine people who died defending it.