Lausanne (Switzerland): The P5+1 powers and Iran on Thursday announced that they reached breakthrough in the nuclear talks and a tentative deal had been achieved.

The statement was read out in a joint press conference in this Swiss city by the EU high representative, Federica Mogherini, and Iran's Foreign Minister Mohammad Javad Zarif, CNN reported.

The basis for an agreement for a peaceful Iranian nuclear programme and a lifting of sanctions against Iran has been reached, Mogherini announced. "We have reached solutions on key parameters of a joint comprehensive plan of action," she said.

Announcing key elements of the deal, Mogherini said that Iran's enrichment capacity and stockpile will be limited, and its sole enrichment facility will be at the Natanz nuclear facility. Other nuclear facilities will be converted for other uses, she added.

US Secretary of State John Kerry tweeted that "parameters to resolve major issues" have been reached.

Earlier, Iranian President Hassan Rouhani also tweeted: "Solutions on key parameters of Iran nuclear case reached. Drafting to start immediately, to finish by June 30th."