For the first time, the US has revealed the size of its nuclear stockpile - a figure it has kept a secret for half a century.<br /><br />The US and Iran have traded barbs at a nuclear non-proliferation conference at the United Nations in New York City.<br /><br />Mahmoud Ahmadinejad, Iran's president, criticised the US for being hypocritical on its nuclear stance.<br /><br />Hillary Clinton, the secretary of state, said Iran was diverting "attention away from its record in an attempt to evade accountability" over its nuclear programme.<br /><br />She also warned that "potential violators [of the Non-Proliferation Treaty] must know that they will pay a high price if they break the rules".<br /><br />Al Jazeera's Kristen Saloomey reports from the United Nations (04 May 2010).
