Talks between the United States and Iran to revive a nuclear deal will be continued beyond Friday, the planned deadline.
The two countries have been holding indirect talks intermittently in Vienna, Austria, since early April to revive the 2015 agreement on Iran's nuclear program. The European Union and other parties have been brokering the dialogues.
On Wednesday, senior officials from relevant countries held the latest round of meetings.
Iran had been warning that it would stop cooperation with the International Atomic Energy Agency over inspections of its nuclear sites unless negotiations produce some results by Friday, including a US pledge to lift sanctions.
After the meetings, Iran's Deputy Foreign Minister Abbas Araghchi told NHK that there were still some key issues left to be decided.
Araghchi added that it was time for the US to return to the deal and lift the sanctions.
He said that the Iranian delegates are leaving Vienna "with hope that we would resume our job next week and hopefully we can conclude it."
Asked about continued cooperation with IAEA, Araghchi said the Iranian government would decide later.