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Regional rivals Saudi Arabia and Iran traded accusations Tuesday over the escalating conflict in Yemen, which the UN rights chief warned was on the brink of "total collapse". The Huthi rebels and their ally, former president Ali Abdullah Saleh, "decided with the support of Iran to destabilise Yemen," Saudi Foreign Minister Prince Saud al-Faisal said. Tehran hit back, accusing Saudi Arabia of putting the entire Middle East in jeopardy. Iranian state media rejected as "utter lies" claims Tehran had sent arms to Yemen, but said it had dispatched non-military aid, including food and medicine.