LONDON: Four children have been killed by landmines and unexploded ordnance in Syria in less than a week, Save the Children said on Tuesday, warning that explosive remnants of war are endangering families returning home after years of displacement. Three children aged 8 to 12 were killed on Monday when unexploded ordnance detonated as they herded sheep near Palmyra, according to local news reports. Their deaths followed a landmine explosion at a school in Hasakah last week that killed a child an