Negotiating teams from the United States and Iran could return to Islamabad later this week, five sources said on Tuesday, days after high-level talks ended without a breakthrough.

A source involved in the discussions said no date had been finalised, but both sides could return as early as the end of the week.

“No firm date has been set, with the delegations keeping Friday through Sunday open,” a senior Iranian source said.

First High-Level Contact in Decades

The weekend meeting in Islamabad marked the first direct encounter between U.S. and Iranian officials in more than a decade, and the most senior engagement since Iran’s 1979 Islamic Revolution.

The talks were held four days after last Tuesday’s ceasefire announcement.

A proposal has been shared with both sides to send their delegations back to resume negotiations, a source said.

Pakistan Acting as Go-Between

Two Pakistani sources said Islamabad was in contact with both countries regarding the timing of the next round, which is likely to take place over the weekend.

“We have reached out to Iran and we got a positive response that they will be open to a second round of talks,” a senior Pakistani government official said.

Pakistan’s foreign ministry, military and prime minister’s office did not respond to requests for comment. The White House also did not immediately comment.

Key Issues on the Table

U.S. Vice President JD Vance and Iranian parliamentary speaker Mohammad Baqer Qalibaf led their respective delegations in the previous round.

Discussions focused on several key issues, including the Strait of Hormuz, Iran’s nuclear programme and international sanctions on Tehran.

Iran has effectively blocked the Strait, a major route for global energy supplies, while the U.S. has vowed to reopen it.

U.S. Puts Forward Final Offer

Speaking after the talks, Vance said Washington had presented its position clearly.

“We leave here with a very simple proposal, a method of understanding that is our final and best offer,” he said.

“We’ll see if the Iranians accept it.”

(with inputs from Reuters)