The talks in Vienna, home of the International Atomic Energy Agency (IAEA), took place a day after separate but related talks at the United Nations in New York, where Iran and P5+1 held their highest-level meeting in a generation.

Herman Nackaerts, IAEA deputy director general, said the discussions, at Iran's diplomatic mission, had been "very constructive" but gave no details.

At the next meeting on October 28, Iran and the IAEA would "start substantial discussions on the way forward to resolve all outstanding issues," he said.

The meeting was also signaling hope of finding an end to nearly two years of deadlock over Tehran's peaceful nuclear program.

The meeting - the 11th since early 2012 - was shorter than previous ones, just over four hours.

Iranian Ambassador Reza Najafi, leading the Islamic Republic's negotiating team for the first time since his appointment last month, said he hoped for an agreement soon.

"We, indeed, should continue these constructive discussions and we hope that we could reach an agreement as soon as possible," he told reporters, standing next to Nackaerts.

He, however, emphasized that no one should expect “all issues to be resolved in a one round of negotiations.”

IAEA has conducted numerous inspections of Iran's nuclear facilities, but has never found any evidence showing that the Iranian nuclear energy program has been diverted toward military objectives.

NJF/NJF