The US, Britain and France have interrupted proceedings at the G20 summit to demand immediate international access to Iran’s secret uranium enrichment bunker.“Iran is breaking rules that all nations must follow, endangering the global non-proliferation regime, denying its own people the access to the opportunity they deserve and threatening the stability and security of the region and the world,” said President Barack Obama. Britain’s Gordon Brown and France’s Nicolas Sarkozy added their patience was wearing thin. “We must not let the Iranian leadership gain any more time while the centrifuges spin, and if by December there is not a profound change in Iran’s policies sanctions will be imposed, for the sake of peace and stability,” said Sarkozy. The underground facility is allegedly near the Shia holy city of Qom, and will be able to produce enough material for one bomb a year when completed. The US says it has been tracking it for several years. The three western powers say they decided to go public at the G20 meeting because Iran has just discovered security at the plant has been breached.