Iran and weapons of mass destruction: As of 2007, Iran is not known to possess weapons of mass destruction and has signed treaties repudiating their possessions, including the Biological Weapons Convention, the Chemical Weapons Convention, and the Nuclear Non-Proliferation Treaty (NPT). A number of countries, including the United States, the United Kingdom, and France, have accused Iran of a clandestine intention to develop nuclear weapons.[11] By most estimates, Iran is at least two to six years away from being able to produce an atomic bomb, even if it wanted to.[12]