Iran's foreign minister says he believes it is "possible" to reach an agreement as negotiations with world powers are set to go past the June 30 target date without a deal.
"I am here to get a final deal and I think we can," Javad Zarif told reporters at the start of a meeting with U.S. Secretary of State John Kerry on June 30.
After consultations with Iranian leadership, Zarif returned to Vienna earlier on June 30 as Iran, Britain, China, France, Germany, Russia, and the United States work to strike a final deal, under which Tehran would curb its nuclear program in exchange for sanctions relief.
Zarif returned with nuclear chief Ali Akbar Salehi and Hossein Fereydoon, a brother and close aide of President Hassan Rohani.
The United States, France, and Iran have said there is no new target date for a deal.
Kerry has warned it was "too early" to tell if an agreement with Iran is possible.
The six powers want limits on Tehran's nuclear programs that could have a military use.
Tehran denies it is pursuing atomic weapons.