a half years of war after Houthi rebels, believed to be backed by Iran, captured the capital, Sanaa, and overthrew President Abd-Rabbu Mansour Hadi's government.

A Saudi-led coalition was formed in 2015 to fight the Houthi rebels and army troops allied with them.

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According to the UN, the conflict has killed more than 10,000 people and left over seven million in need of food assistance.

Millions of others do not have adequate access to health, water and sanitation services.

The country has also been hit by a cholera outbreak, with some 900,000 suspected cases since April.

Dire situation

Calling for a five-point action plan, Lowcock on Wednesday urged the Saudi-led coalition to reopen the airspace for humanitarian flights into Yemen and provide assurances that access would not be disrupted again.

He also called for anlifesaving medical supplies have ceased, potentially affecting hundreds of thousands of people."

Saudi Arabia said the closure of was aimed at preventing the smuggling of weapons into Yemen and accused its regional rival Iran of providing the missile that was launched by the Houthis on Saturday.

Iran has denied the accusation.