Iran and the United States have resumed the latest session of their current round of talks in the Swiss city of Lausanne in an attempt to bridge differences over Tehran’s nuclear program

Iran and the United States have resumed the latest session of their current round of talks in the Swiss city of Lausanne in an attempt to bridge differences over Tehran’s nuclear program.

Iran’s Foreign Minister Mohammad Javad Zarif and US Secretary of State John Kerry opened discussions in Lausanne on Tuesday.

Following his first day of talks with Kerry, Zarif flew to the Belgian capital of Brussels and held talks with his German, French and British counterparts, respectively, Frank-Walter Steinmeier, Laurent Fabius and Philip Hammond.

The foreign policy chief for the 28-member European Union, Federica Mogherini, was also present in the talks.

Speaking to reporters after the meeting, Mogherini, who is negotiating with Iran on behalf of the P5+1 countries, said that all sides were aware of the fact that it is important to seal a good deal, and that it was not clear whether "a technical solution" to fill the remaining gaps can be found.

"I see the elements for a deal to be reached, but I still see the gaps that need to be filled," she said.

The UK foreign secretary also said Iran and the six countries have made progress toward reaching an agreement to settle the Western dispute over Tehran’s nuclear program. "We're still making progress, but there is a long way to go if we're going to get there," Hammond said after the talks.

Meanwhile, the French foreign minister said, "It's always useful to talk but we, the French, want a solid deal." "Certain points are yet to be resolved, we hope we will be able to resolve them, but as long as it's not done, it's not done," Fabius added.

Ahead of the meeting, the German foreign minister urged the negotiators from Iran and the P5+1 group of countries to "seize this opportunity" of talks in Brussels and in Switzerland this week to finally clinch a so-far elusive deal.