Iran nuclear: Kerry and Zarif meet at the UN
The highest-level talks on Iran's nuclear programme for at least six years have been held at the United Nations in New York, the BBC reported.
US Secretary of State John Kerry met Iranian Foreign Minister Mohammad Javad Zarif.
Diplomats from the P5+1 group - China, Russia, Britain, France and Germany - were also present at the talks.
They agreed to hold substantive talks on the issue in the Swiss city of Geneva, beginning on 15 October.
Following the meeting, Mr Kerry said he was pleased that Mr Zarif "put possibilities on the table", but said a lot of work remained to be done and that Iran would have to answer questions about its nuclear programme.
"One meeting and a change in tone, which was welcome, doesn't answer those questions yet," he said.
Mr Zarif called the talks "constructive" and said the diplomats had made progress on resolving international issues in a manner that respected the rights of the Iranian people.
"I am satisfied with this first step," he said. "Now we have to see whether we can match our positive words with serious deeds so we can move forward."
Mr Zarif insisted Iran's nuclear programme was "nothing but peaceful" and pledged to prove it to the international community.
The Iranian foreign minister called sanctions against Iran "counterproductive" and added he hoped all bilateral, unilateral and multilateral sanctions would be lifted in the near future.