Iran says 'some progress' made in nuclear talks but still 'long way' to reach final agreement

Iranian Foreign Minister Mohammad Javad Zarif has reportedly said that "some progress in certain aspects" has been made in talks to reach an agreement on Iran's nuclear program.

After two days of meeting with his U.S. counterpart, Zarif said that the talks had been "useful, constructive and serious" but warned it was still "a long way to reach a final agreement," reported the BBC.

U.S. officials also asserted that "some progress" had been made but added that much remained to be done.

The dialogue was part of the latest three-day round of negotiations to seal a nuclear deal.

The statement came days after U.S. Secretary of State John Kerry warned that the U.S. was ready to walk away from the negotiations if Tehran did not demonstrate its willingness to curb its nuclear ambitions.

The talks were part of the latest three-day round of Iran's negotiations with the US, Russia, China, Britain, France and Germany.

World powers and Iran had set an end of March deadline to reach a framework agreement, with four months to work out the technical details of the deal. The deadline to secure a deal has been postponed twice previously.

However, despite the looming deadline, U.S. officials have said that they would not "rush to an agreement that does not fulfil the objectives given to them by President Obama."

The P5+1 nations, including, the U.S., the United Kingdom, France, Germany, Russia and China, accuse Iran of building nuclear weapons under the pretense of developing its nuclear capabilities for civilian purposes. They want Tehran to curb its nuclear ambitions in return for the lifting of United Nations sanctions.