In an April 2009 speech in Prague, President Obama pledged that his Administration would launch "a new international effort to secure all vulnerable nuclear material around the world within four years." To motivate world leaders to achieve this goal, the President hosted a Nuclear Security Summit in Washington, DC, on April 12-13, 2010. Leaders of 47 countries attended the summit, including many heads of state. Attendees represented a wide geographic range of states and nuclear capabilities, and include China, India, Israel, and Pakistan. The summit resulted in a joint statement saying that international cooperative action is necessary to prevent an act of nuclear terrorism. Summit attendees also pledged to improve nuclear security standards, bring international agreements into force, and share best practices. A second summit will be held in South Korea in March 2012.