"After years of Iranian delay, deception, and denial, this agreement should not lead us to a false sense of security about the Iranian proliferation threat," Senator Richard Lugar said at a hearing on the potential threat posed by Iran.

"Through its active support for terrorism and its continued efforts to develop weapons of mass destruction in direct violation of the Nuclear Nonproliferation Treaty," said Lugar.

Tehran agreed to enhanced United Nations inspections of it nuclear facilities and said it would temporarily suspend its enrichment of uranium that could be used to make nuclear weapons in the hope of avoiding international sanctions.

Lugar said that the agreement was a step forward, but urged a measure of caution.

"We should not lose sight of the fact that Iran was caught red-handed trying to build nuclear weapons through several methods over a sustained period in violation of its treaty obligations."

"It is far from clear that the additional inspections to which Iran has agreed will prevent Iran from obtaining a nuclear capability, because they rely on Teheran telling the truth," the Indiana Republican said.

"The international community must be prepared to take more effective action."

He continued that "the United States should begin laying the groundwork now for a decisive international response to any additional violations" by Iran.

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