Congress leaders on Thursday paid tributes to late Prime Minister Indira Gandhi on her 35th death anniversary and remembered her contribution to national security, economy and foreign policy. Congress President Sonia Gandhi, former President Pranab Mukherjee, former Vice President Hamid Ansari, former Prime Minister Manmohan Singh and Rajasthan Chief Minister Ashok Gehlot were among those who paid floral tributes to the late prime minister at a remembrance ceremony held at Shakti Sthal.  MPs from the party and large number of party workers were also in attendance at the ceremony.