For the second time in as many days, negotiators on Wednesday extended diplomatic talks aimed at curbing Iran's nuclear program after failing to reach a preliminary agreement.
"We continue to make progress but have not reached a political understanding," a State Department spokeswoman, Marie Harf, said.
The U.S., Iran, and the five permanent members of the U.N. Security Council plus Germany were originally supposed to reach a framework deal by the end of March. But snags concerning economic sanctions and the storage of Iran's nuclear fuel, among other things, forced the extensions.
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