VIENNA (Tasnim) � Iran and six world powers can strike a comprehensive deal on Tehran's nuclear energy program before the end-June deadline if a series of solutions that had been reached in Switzerland in April are taken into account, a diplomatic source told Tasnim.

"A deal is doable in these remaining days, provided that the previous solutions, reached in Lausanne, are used as the basis," a diplomatic source familiar with the negotiations told Tasnim in Vienna on Friday.

On April 2, Iran and the Group 5+1 (Russia, China, the US, Britain, France and Germany) reached a framework nuclear agreement in Lausanne, Switzerland, that provides outlines of a final agreement, known as the Joint Comprehensive Plan of Action (JCPOA).

The parties have set end of June as the deadline for clinching the long-awaited deal that would end more than a decade of impasse over Tehran's peaceful nuclear program.

Following the framework agreement in Lausanne, tight meetings began at the level of deputy foreign ministers and experts to draft the text of the final deal.

Meanwhile, Iranian Foreign Minister Mohammad Javad Zarif and US Secretary of State John Kerry have arrived in the Austrian capital to help finalize the accord.

Foreign ministers of Britain, France and Germany as well as the European Union's foreign policy chief Federica Mogherini will also join the high-profile talks on Sunday.

By Tasnim News Agency