Iran has rejected a European proposal to stop enriching uranium in return for nuclear technology, saying the deal was "unbalanced."
The Iranian Foreign Ministry said Sunday suspending enrichment activities is unacceptable. But it added that Tehran still wants to negotiate with the envoys from Britain, Germany and France.
Later Sunday, Iranian nuclear officials said a nuclear facility that will be a key part of the uranium enrichment process is nearing completion. They say the plant at Isfahan is now 70 percent operational.
The United States suspects Iran is secretly working to develop nuclear weapons -- something Tehran denies. U.S. officials want the International Atomic Energy Agency to refer Iran to the United Nations Security Council next month for possible sanctions.