Displaced Yemenis take shelter at the al-Waara camp in the Khokha district as millions are caught up in a dragging war in which Huthi rebels have been fighting for more than three years against the Yemeni government, which is backed by a Saudi-led military coalition. While the Saudi-led coalition has come under fire for air raids that have killed civilians, including children, in rebel-held areas, the Huthis have been accused of widespread and indiscriminate use of landmines.