Prime Minister Narendra Modi on Friday attended the opening plenary session of the Fourth Nuclear Security Summit here.
"A careful examination of #nuclearsecurity issues on the agenda as PM arrives for Opening Plenary of #NSS2016, " external affairs ministry spokesman Vikas Swarup tweeted as Modi joined leaders of 50 nations at the Walter E. Washington Convention Center here.
In his opening remarks, US President Barack Obama said that 102 countries have till now ratified the Convention on the Physical Protection of Nuclear Material (CPPNM).
In the opening session, Modi is expected to share India's progress report on the work it has done since the last summit and also give his suggestions in the form of interventions.
In the second session over a working lunch, the focus of discussions will be on international institutional actions to strengthen nuclear security.
The third and final session of the summit will see the leaders engaged in a policy discussion on nuclear terrorism based on a hypothetical scenario.
This year's summit is the fourth and final of the biennial affairs.
The first summit was held in Washington in April 2010 followed by the summits in Seoul in March 2012 and The Hague in March 2014.