The White House statement says the US condemns the Iranian government's activities and stands with Saudi Arabia and other Persian Gulf partners against Iran's aggression and "blatant" violations of international law.
It says missile systems were not present in Yemen before the civil war there, alleging that Iran provided them. The statement also urges the United Nations to review evidence that Iran is perpetuating the war in Yemen to further its regional ambitions.
In response to the Houthis' missile assault, a Saudi-led coalition announced it has closed all ports in Yemen as of Monday, sparking UN concerns as all humanitarian flights have also been grounded, with trucks stuck at crossings and ships carrying basic necessities like fuel, wheat and other food have been ordered to leave.
The UN warned that the shut-down of the ports could exacerbate the already difficult humanitarian crisis, as the war has already brought the country to the brink of famine.
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Officials including a top military commander close to Hadi told The Associated Press that oil-rich Saudi Arabia has prevented Hadi, his sons, officials and ministers from returning to Yemen.
The ban was prompted by the bitter enmity between Hadi and the United Arab Emirates, they said, speaking on condition of anonymity because of the sensitivity of the subject.
Quoting an unnamed official, the statement said the reports are a "systematic campaign targeting Saudi Arabia which leads a battle to stop the Iranian interference in Yemen and the region." The Saudis and the UAE are the main pillars of the coalition.