TEHRAN: Iran's chief negotiator said Tuesday talks in Geneva with world powers late into the night on implementing a landmark nuclear deal had made “good progress”, according to state TV.

“The negotiations continued until 4:30 am in Geneva and the two sides have made good progress on different issues, but we cannot prejudge the results before the end of the negotiations,” lead negotiator Abbas Araqchi said.

He added that there would “probably be another round of negotiations before noon and before announcing the results”.

Experts from Iran and the so-called P5+1 — the United States, Britain, France, Russia and China plus Germany — have been holding technical talks on implementing an agreement reached Nov 24 on Iran's controversial nuclear program.

The interim deal requires that Iran freeze or curb its nuclear activities for six months in exchange for some sanctions relief while the two sides try to reach a comprehensive agreement.

Western nations and Israel have long suspected Iran is covertly pursuing a nuclear weapons capability alongside its civilian program, charges denied by Tehran, which insists its uranium enrichment is for purely peaceful purposes.