New Delhi, Dec 13 (ANI): On the anniversary of 2001 Parliament attack, Prime Minister Narendra Modi paid tribute to the martyrs who lost their lives during attack. Along with PM Modi, former PM Manmohan Singh, Congress President Sonia Gandhi, Home Minister Rajnath Singh, External Affairs Minister Sushma Swaraj, Lok Sabha Speaker Sumitra Mahajan and BJP senior leader LK Advani also paid tribute to the martyrs. Earlier in the day, PM Modi had tweeted "We salute martyrs who lost their lives protecting the Temple of our Democracy on this day in 2001. Their sacrifices are etched in our memory". On December 13, 2001, heavily armed terrorists infiltrated the Parliament House and began firing their weapons during the time of Parliament session.