"The port of Hodeida is a launching pad for terrorist operations threatening navigation in the Red Sea and the Bab al-Mandab Strait", coalition spokesman Turki al-Maliki said late Wednesday.
The Saudi-led coalition intervened in the Yemen war in March 2015 to try to restore President Abedrabbo Mansour Hadi to power after the Houthis, backed by Saleh's supporters, forced him into exile.
The Red Sea is a key shipping route for world trade that connects the Middle East to Europe via the Suez Canal.
The report presented to the UN Security Council on 9 January said: 'The panel has identified missile remnants, related military equipment and military unmanned aerial vehicles (UAVs) that are of Iranian origin and were introduced into Yemen after the imposition of the targeted arms embargo'.
Iran has strongly denied arming the Huthis and in December 2017 accused the USA of presenting "fabricated" evidence that a November 4 missile fired at Riyadh airport was Iranian-made.
United Nations officials have been trying to get the two sides back to the negotiating table after talks collapsed 2016.
Iran-backed Huthi rebels, who are locked in a war with Yemen's Saudi-backed government, said they shot down the plane over Saada, their northern Yemeni stronghold, according to their Al-Masirah television channel.
The Saudi Air Defense Forces on Thursday intercepted a ballistic missile launched by the Houthi militias over Najran. Col.
More than 10,000 civilians have been killed in fighting and airstrikes; more than 7 million are on the brink of starvation and over 19 million don't know where their next meal is coming from; medical infrastructure has collapsed; and a cholera outbreak has affected 1 million people.