Yemen’s warring parties agreed to extend a four-month long truce for a further two months just hours before it was due to expire, the United Nations announced Tuesday. Yemen has been gripped by conflict since the Iran-backed Houthi rebels took control of the capital Sanaa in 2014, triggering a Saudi-led military intervention in support of the beleaguered government the following year. But a truce came into effect on April 2 and was renewed from June 4, providing a rare respite from violence for much of the country and alleviating some of the suffering. The latest extension, running from August…