A boy and his sisters watch graffiti artists spray on a wall, commemorating the victims who were killed in Saudi-led coalition airstrikes in Sanaa, Yemen, Monday, May 18, 2015. Saudi-led airstrikes targeting Yemen's Shiite rebels resumed early on Monday in the southern port city of Aden after a five-day truce expired amid talks on the war-torn country's future that were boycotted by the rebels.

Kuwait To Send Ground Troops To Join Saudi War In Yemen

The conflict has so far killed more than 6,000 people. The U.N. agency for children, UNICEF, has said that nearly half of those killed in the war so far have been civilians, and that 637 of them have been children.