The French foreign minister says Iran and six world powers have reached a first-stage agreement on curbing Iran's nuclear program in return for sanctions relief.
Laurent Fabius gave no details as he left a meeting of foreign ministers in Geneva early Sunday in a fifth day of talks.
A formal announcement is expected soon.
In Washington, President Barack Obama will make a statement this evening on the agreement.
The nuclear deal was finalized during talks that stretched well past midnight.
The interim deal is aimed at slowing progress on Iran's nuclear program while a broader agreement is negotiated.
As part of the interim agreement, the U.S. offered the Iranians limited relief from crippling economic sanctions.