Kerry tweeted that all sides have the "parameters to resolve major issues" on Iran's nuclear program and will soon get back to work on a "final deal."
"Big day," he further tweeted.
Also, Iran's President Hassan Rouhani minutes ago voiced satisfaction in the outcomes of the latest round of talks between Tehran and the Group 5+1 (the five permanent UN Security Council members plus Germany) in the Swiss city of Lausanne.
"Solutions on key parameters of Iran nuclear case reached," President Rouhani wrote in a new post on his Tweeter page.
"Drafting (of the final deal) will start immediately to finish by June 30th," he added.
Iran and G5+1 started their new round of talks in Lausanne, Switzerland, last Thursday to narrow their differences over Tehran's nuclear energy program ahead of a July 1 deadline.
