U.S. and Iranian officials continue negotiations in Switzerland into a second day on Monday, following a tense start to the talks. Multiple reports say Iran announces it has again closed the Strait of Hormuz, a critical maritime route, adding to regional uncertainty. At the same time, U.S. President Donald Trump repeats threats related to Iran, according to the reports. The combination of Tehran’s statement about Hormuz and Trump’s warning frame the negotiations as high-stakes, with both sides’ positions described as firm at the outset. Talks are taking place in Switzerland’s Burgenstock area, where officials from both countries are working through the next steps of the negotiation process. The reports characterize the first day as marked by heightened rhetoric and security concerns, with Iran’s decision on Hormuz and U.S. threats contributing to tensions. Coverage indicates that the negotiations are proceeding despite the latest developments affecting shipping and broader diplomacy.