U.S. Secretary of State Condoleezza Rice "talked about how it's time for the Security Council to take additional steps on the diplomatic front if Iran continues down the current path that they are on," White House spokesman Scott McClellan told a news briefing.

McClellan said Iran's announcement that it has successfully enriched uranium "only further isolates the regime, and we are consulting with the Security Council, we are consulting with our friends and allies, who are also concerned about this issue."

"I think the international community is united in our concern and determination to prevent the regime from developing a nuclear weapons capability or nuclear weapons, and we'll continue those consultations about what the next steps would be," he said.

The United States has accused Iran of trying to develop nuclear weapons under the cover of civilian nuclear programs. However, Iran has said its nuclear programs are for civil purposes only.