Majid Takht-Ravanchi, Iran's deputy foreign minister, tells the BBC's Lyse Doucet that the ball was "in America's court to prove that they want to do a deal".

"It is positive that the Americans appear willing to tolerate Iranian enrichment within clearly set boundaries," Hakan Fidan said

Majid Takht-Ravanchi, Iran's deputy foreign minister, tells the BBC's Lyse Doucet that the ball was "in America's court to prove that they want to do a deal".