riyadh saudi air defenses shoot ballistic missile fire yemen houthi group towards riyadh tuesday saudi-led coalition say attack could escalate proxy war kingdom iran report casualties damage contrast u.n. human right spokesman say coalition air strike kill least 136 non-combatants war-torn yemen since dec. 6. iran-aligned houthi movement say aim missile saudi royal court al-yamama palace meet saudi leaders way describe attack new chapter conflict saudi-led coalition say missile late several fire towards riyadh direct residential areas damage quote statement coalition saudi state news agency spa say iranian-made missiles threat regional international security accuse houthis use humanitarian entry point yemen smuggle missiles saudi arabia regional arch-foe iran coalition force confirm intercept iranian-houthi missile target south riyadh report casualties time government-run center international communication write twitter account saudi palaces military oil facilities within range missiles houthis say statement carry group al-masirah television u.s. state department condemn missile attack call iran stop arm houthis unite nations u.s. ambassador nikki haley say houthi missile strike bear hallmarks previous attack use iranian-provided weapons haley say explore u.n. security council colleagues several options pressure iran adjust behavior haley likely struggle however convince members like veto power russia china u.n. action need saudi arabia iran lock struggle influence middle east conflict saudi arabia backyard yemen kill 10,000 people displace million houthis part fire several missiles kingdom cause serious damage attack come houthis mark 1,000 days since saudi-led coalition begin military operations yemen march 2015 iran-aligned group drive yemeni president abd-rabbu mansour hadi exile enemies mirage calculations ... 1,000 days great steadfastness say abdel-malek al-houthi houthi leader speech group al-masirah tv unite arab emirates close ally saudi arabia part coalition say late houthi attack underscore need keep military campaign yemen go every iranian missile fire houthi militia civilian target necessity operation decisive storm become clear unite arab emirates minister state foreign affairs anwar gargash write twitter account lebanese prime minister saad al-hariri condemn attack say action exacerbate divisions region saudi arabia iran also compete influence iraq syria reuters witness describe hear blast say saw smoke northeast riyadh saudi arabia crown prince mohammed bin salman describe riyadh say iran supply rocket houthis direct military aggression could act war iran deny supply weaponry houthis take yemeni capital sanaa part country civil war saudi arabia say nov. intercept ballistic missile riyadh king khaled airport attack lead coalition close yemeni port nov. 30 saudi arabia shoot another missile near southwestern city khamis mushait last week unite state present first time piece say iranian weapons supply houthis describe conclusive evidence tehran violate u.n. resolutions arm include char remnants pentagon say iranian-made short-range ballistic missile fire yemen nov. attack well drone anti-tank weapon recover yemen saudis saudi arabia intercept houthi missile fire toward riyadh report casualties