"We also hear unconfirmed reports that movements of forces in Yemen are on the increase and that the bad prospect of intensive military operations in al-Hodeidah, long heralded, may be soon forthcoming", he said.
The UN's envoy for Yemen told the Security Council Tuesday that within two months he will draft a framework for talks aimed at ending the country's ongoing civil war.
Griffiths, however, warned that intensified fighting between the warring sides in Yemen could "in a stroke, take peace off the table".
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Al-Maliki repeated previous statements accusing Iran of providing missile components to the Houthis.
Though mostly symbolic rather than effective, the use of drones and missiles by the Houthis allows them to generate worldwide headlines by threatening global shipping in one of the world's busiest trading arteries and raise the domestic costs of Riyadh's ongoing intervention in Yemen, which is now entering its fourth year. Saudi authorities say over the past three years 90 ballistic missiles have been fired at the kingdom by the rebels.
Colonel Turki al-Maliki, spokesman for the Saudi-led coalition, claimed the attack was launched at 10.16pm on Monday from the Houthi-held Amran province in western Yemen.
Griffiths briefed the council after traveling to the region for talks in Riyadh, Sanaa and other key capitals on prospects for re-launching peace talks which he insisted to the council "can be done".
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US Ambassador Nikki Haley thanked Griffiths, a British national, for taking on the Yemen mission, but stressed the new peace effort must address Iran's military support to the Houthis.
Russian Federation in February vetoed a British-drafted resolution strongly supported by the United States that would have put pressure on Iran over its failure to block supplies of missiles to the Houthi militias.
The war has killed more than 10,000 people, displaced more than 2 million and driven the country to the verge of starvation.
But Tehran has repeatedly denied arming the rebels, which would violate a United Nations weapons embargo slapped on Yemen in 2015.
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With the return of the rainy season, Yemen once again risks another major outbreak of cholera, United Nations aid chief Mark Lowcock told the council.