BERLIN - Secretary of State Condoleezza Rice warned Iran on Thursday the "international community is united" in the dispute over its nuclear program, but a Tehran envoy defiantly rejected a U.N. call to reimpose a freeze on uranium enrichment. Rice spoke after a meeting in Berlin among diplomats from the five veto-wielding members of the U.N. Security Council plus Germany over ways to press Iran to stop enriching uranium, which can be used for weapons. Iran says its program is peaceful.

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