As the Saudi military reinforces security along the border with Yemen, Morocco reports that one of its fighter jets has gone missing over the country.<br /><br /> The loss of the plane, and exchanges of heavy weapons fire across the border, could jeopardise a humanitarian truce due to begin on Tuesday.<br /><br /> Yemen’s Houthi militia, which is allied with Iran, say regional tribesmen shot down the Moroccan jet.<br /><br /> Numerous people, including civilians and soldiers, have been killed in the exchanges of fire across the Saudi-Yemen border.<br /><br /> New Saudi-led airstrikes have set off large explosions in the capital, which is controlled by the Houthis. The residence of former president Saleh has been left in ruins.<br /><br /> Attempting to restore exiled President Mansour Hadi to power, Riyadh has been bombing the Houthis and army units loyal to Saleh since the end of March.<br /><br /> An untold number of people have been killed and wounded in the conflict.<br /><br /> The humanitarian situation on the ground has been worsening, with widesp
