The United States said that a UN agency report showed "Iran's continued failure to comply with its international obligations and its sustained lack of cooperation" with the UN on its nuclear programme.
National Security Council spokesman Michael Hammer reacted to portions of a restricted UN report which revealed yesterday that Iran had produced at least 5.7 kilos (12.5 pounds) of higher-enriched uranium.
The International Atomic Energy Agency (IAEA) said in the restricted report that it "remains concerned about the possible existence in Iran of past or current undisclosed nuclear related activities, involving military-related organisations."
"This latest IAEA report clearly shows Iran's continued failure to comply with its international obligations and its sustained lack of cooperation with the IAEA," Hammer said in a statement.
"Most notably, the report outlines Iran's continued uranium enrichment at both 3.5-per cent and near-20-per cent levels, construction of a heavy water research reactor, and refusal to permit the IAEA the access necessary to answer the ongoing questions... And long outstanding questions that surround a possible military dimension to its nuclear programme."