UN Secretary-General António Guterres wrote on social media that he is "gravely alarmed" by what he defined "the use of force by the United States against Iran today"."This is a dangerous escalation in a region already on the edge - and a direct threat to international peace and security", he wrote, "There is a growing risk that this conflict could rapidly get out of control - with catastrophic consequences for civilians, the region, and the world".Guterres added: "I call on Member States to de-escalate and to uphold their obligations under the UN Charter and other rules of international law. At this perilous hour, it is critical to avoid a spiral of chaos"."There is no military solution", he concluded, "The only path forward is diplomacy. The only hope is peace".