Saudi officials offered no justification for the attack, which added even further to United Nations concerns about the shortages across Yemen. The top Iranian diplomat said, "Blocking of humanitarian access to an already famine-stricken Yemen and the decision to "close all Yemeni air, sea and land ports" have further deteriorated the humanitarian nightmare in Yemen".
The United Nations has listed Yemen as the world's top priority humanitarian crisis, with more than 17 million people lacking food, seven million of whom are at risk of starvation.
Ambassador Abdallah Al-Mouallimi reiterated at a news conference at United Nations headquarters in NY on Monday that closed seaports and airports will start reopening within the 24 hours promised late Sunday.
Last week, the Saudi-led coalition said it was closing Yemen's ground, air and sea ports after a ballistic missile was sacked over the Saudi capital from Yemen.
Al-Mouallimi also accused the Houthis of diverting humanitarian aid "to fulfill their own requirements" and "to trade in the black market and achieve exorbitant profits at the expense of the Yemeni people".
The US-backed coalition led by Saudi Arabia has been at war in with the Shiite rebels known as Houthis since March 2015.
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The humanitarian organizations of the United Nations have expressed their concerns about the blockade of Yemen, saying that it could lead to a significant deterioration in the health and food situation in the country.
Sammad said that with the blockade, the coalition "shut down all doors for peace and dialogue". The Saudi closure had drawn worldwide condemnation and fears of a worsening humanitarian disaster in Yemen.
The first step towards the reopening is expected to be taken within 24 hours of the announcement made on Monday, however, at the time of writing, there are no media reports of any action taken by the coalition in the direction.
We heard [from the Saudis] that Aden and Mukalla ports are now open - but this is not enough.
Since Saudi Arabia has closed the Hodeideh Port in western Yemen, civilians have been at a high risk of starving to death or dying from an illness due to the lack of medicine.
Saudi Arabia and the US have accused Iran of supplying the ballistic missile used in that attack.