Yemen sees major prisoner swap amid peace talks.

A major prisoner swap between warring sides in Yemen is under way, with about 900 prisoners expected to be exchanged over the next three days. The exchange is seen as a confidence-building measure, following talks earlier this week in Sanaa between a Saudi delegation and Houthi rebels aimed at reaching a new and potentially permanent ceasefire. The war between rebels and pro-government Saudi-led forces has left tens of thousands of Yemenis dead and created one of the world's worst humanitarian crises.