State Department spokesman Crowley slams Teheran's announcement of new centrifuges, Jerusalem Post reported.
The United States overnight Friday slammed Iran's earlier announcement of technological advances in its nuclear program, saying it proves Teheran's "nefarious intentions."
State Department spokesman P.J. Crowley made the statement hours after the Islamic Republic announced that it successfully tested a third generation of domestically built centrifuges, which, it claims, can accelerate a uranium enrichment by up to six times.
Iranian President Mahmoud Ahmadinejad declared there was no way back for Iran's nuclear work despite opposition from the United States and other world powers, though he insisted it had only peaceful aims like power generation.
Iran would remain a nuclear state, he said, "whether enemies want it or not."
But Ahmadinejad continues to claim Iran's nuclear program is strictly for peaceful purposes.
Israel, the United States and European Union countries suspect Iran is attempting to build a nuclear bomb.