Negotiators from Iran and six world powers ended a marathon session of talks over implementing a nuclear deal Tuesday, with Tehran saying the negotiations had yielded positive results.

Iranian deputy foreign minister and lead negotiator Abbas Araqchi told state-run Press TV that “relatively good progress” had been made in the Geneva meeting and that the results of the negotiations would be announced later Tuesday.

However, he said, there remained issues to work out “at the political level.”

“We cannot prejudge the results before the end of the negotiations,” he said, according to an AFP news agency report.

The expert-level talks were intended for the sides to hash out how to best execute an agreement reached November 24 which calls for eased sanctions in exchange for curbs on Iran’s nuclear program.

Araqchi said the talks, which resumed Monday after a break for Christmas, lasted until 4:30 a.m. Tuesday. He said he would likely soon meet with Helga Schmid, a deputy of EU foreign policy chief Catherine Ashton.

As the talks began Monday, Iranian President Hassan Rouhani was reported as saying that the deal would be implemented in the next two months, according to the semi-official Fars News, which quoted a member of the Iranian parliament who had attended a meeting with the leader.

“Mr. Rouhani referred to the Geneva negotiations and said the negotiations will yield positive results in the next one to two months and then we can have development in the country’s economy,” Jabbar Kouchakinejad told the news agency.

The Iranian delegation met with the six world powers in Vienna on December 12, but cut the meetings short following a decision by the US government to blacklist 19 companies for evading Iranian sanctions.

The delegation flew back to Iran a day before negotiations were set to end, stating that the US’s move violated the interim agreement. In spite of the move, the Iranians resumed talks days later in Geneva.

The West fears Iran is pursuing nuclear weapons under its rogue nuclear program. Iran says the program is for peaceful purposes like power generation and medical research.