U.S. Ambassador to the U.N. Susan Rice reaffirmed in an interview that the U.S. believes Iran is pursuing a nuclear weapons program and is determined to act against it.

"With respect to Iran, as the President has said on a number of occasions, the United States views Iran acquiring an illicit nuclear capacity as a grave threat to ourselves, to the region and indeed to Israel. We are in the process of an early and urgent review of U.S. policy towards Iran. The news today confirms what we all have feared and anticipated, which is that Iran has - remains in pursuit of its nuclear program. There's no ambiguity about that, and our aim is to combine enhanced pressures, and indeed the potential for direct engagement to try to prevent Iran from taking its program to fruition."