The United States and the European Union have said that further sanctions may be the only response to Iran's latest moves in the long-running standoff over its controversial nuclear program.
The EU and the United States argued that Iran broke its obligations towards the UN's International Atomic Energy Agency (IAEA) by boosting its uranium enrichment to higher levels before IAEA inspectors were able to monitor the process properly.
Glyn Davies, the U.S. envoy to the IAEA, said there was "no choice" but for "further, deeper sanctions" against Tehran.
Davies was speaking before the IAEA's 35-member board of governors on the third day of its regular spring meeting in Vienna. Spain, speaking on behalf of the EU, also called for a "clear response."
U.S. Secretary of State Hillary Clinton today said she believes Iran will only negotiate over its nuclear program once fresh sanctions are imposed on it.
compiled from agency reports