RIMBO, Sweden (AP) — Yemeni rebel delegates at talks underway in Sweden to try end their country’s ruinous civil war reported progress on Saturday on the key issues of reopening the airport at the capital, Sanaa, and the implementation of an agreement reached earlier this week on the exchange of prisoners.

U.N. special envoy to Yemen, Martin Griffiths, struck a positive note, saying in a brief statement read to reporters that the two sides were demonstrating a “positive spirit” in the talks, held at a castle in the town of Rimbo, north of Stockholm.