All sides agreed to continue talking for four more months to try reach a final agreement.
US Secretary of State John Kerry met Irain’s Mohammad Javad Zarif on Tehran’s nuclear programme.
Six world powers are negotiating with Iran to scale back on enrichment capacity sharply.
Israel has warned it could bomb nuclear sites if it deems diplomacy incapable of reining in Tehran.
Iran, the US, Britain, France, Germany, Russia and China included the 20 July deadline to reach a pact.
Iran and six other world powers could reach an agreement on Tehran’s nuclear programme.