13th Dec 2001, 11:40 am: 5 terrorists open fire.
5 terrorists entered, killed 8 security personnel, a gardener.
L.K. Advani: 'Most audacious act in two-decades-long Pakistan-sponsored terrorism.'
Parliament attack linked to terrorist groups operating from Pakistan.
Bullet marks from 2001 attack still visible on Parliament walls.
PM Modi and other leaders observe silence for Parliament attack victims.