The second nuclear security summit was held in Seoul, capital of South Korea on26-27 March 2012. 53 heads of state and government, as well as representatives of the United Nations (UN), International Atomic Energy Agency (IAEA), European Union (EU) and INTERPOL, attended the 2012 Seoul Nuclear Security Summit. Compared to the 2010 Washington Summit, there were seven new participants: Azerbaijan, Denmark, Gabon, Hungary, Lithuania, Romania and INTERPOL.
The EU was represented by both the President of the European Council and the President of the European Commission, making the number of participating leaders 58 in total. The first Nuclear Security Summit was held in Washington in April 2010. It was initiated by US President Barack Obama.
