Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US President Warns of Terrorists With Nukes VOA News 12 April 2010 Photo: White House President Barack Obama World leaders are gathering in Washington, DC for an international nuclear summit on developing a global strategy to keep nuclear weapons out of the hands of terrorists. U.S. President Barack Obama, who opens the two-day meeting Monday evening, says terrorists who obtained nuclear materials would be the "single biggest threat" to U.S. security. Mr. Obama told reporters Sunday that terrorist organizations like al-Qaida are trying to secure nuclear weapons, and if they succeed it could change the global security landscape for years to come. He said terrorists would not hesitate to use those weapons. Mr. Obama hopes to enlist other nations to help secure all loose nuclear materials -- items that could cause harm if they fell into the hands of terrorists -- within four years. North Korea, Iran, and Syria, much criticized by the west for their