Iran sticks to 'inadequate, unworkable' stances in atom talks - U.S.
"We are very far apart on some issues", including on uranium enrichment, the senior U.S. administration official told reporters on condition of anonymity.
Another senior U.S. official added that it was difficult to consider extending the negotiations with Iran beyond the July 20 deadline without first seeing "significant progress on key issues" negotiations between Iran and the United States, Britain, France, Germany, Russia and China.
(Reporting By Louis Charbonneau and Fredrik Dahl)