Leaders from six world powers -- the United States, Russia, China, Britain, France and Germany -- met on Thursday with Iranian officials to negotiate the country's nuclear program.
Experts warn the Islamic Republic is getting closer to being able to make atomic arms and that poses a threat to Middle East peace.
Meanwhile, Israel accused Iran of only being months away from having enough materials to make nuclear weapons but Tehran denied any interest saying their program serves only peaceful needs.
"We are talking about peaceful nuclear energy," Saeed Jalili, Iran's chief nuclear negotiator, said before the latest talks. He said Iran had a right to such a program and accused "a handful of countries" of working " to deny this right to others."
The United States insisted it will not tolerate an Iran armed with nuclear weapons.