Oxfam has warned that war-torn Yemen risks a "massive resurgence" of cholera, with around 195,000 suspected cases of the disease recorded so far this year.

An explosion near two schools in the rebel-held Yemeni capital killed 14 children and wounded 16, the UN said Tuesday, but the cause of the weekend blast remains unclear.

Four years after Saudi Arabia led a military intervention in Yemen to back the government against rebels, the only hope for peace in a country threatened by famine hangs on a fragile truce.

Qatar has called on all parties of the conflict in Yemen to abide by international humanitarian and human rights law and to protect the civilians and to strive for national reconciliation

A Yemeni staff member of Action Against Hunger was killed by shrapnel on the roof of her home in the embattled city of Hodeida, the aid group said Tuesday.

Five Yemeni children were killed in an attack on their home in flashpoint Hodeida province, the UN and medics said, months into a ceasefire agreed by the government and rebels.

The UN said Tuesday it had finally reached vital food aid warehouses on Yemen's frontlines as it scrambled to raise $4.2 billion to provide desperately needed assistance in the war-torn country.

Yemen's population needs 4.2 billion dollars in aid this year as the world's biggest humanitarian crisis has deteriorated over the past 12 months of war, UN Secretary General Antonio Guterres told donor countries in Geneva on Tuesday.

The Houthi forces have agreed to draw back from two Yemeni ports on Monday while withdrawal from the main Hodeidah port will occur later alongside a retreat by coalition-backed forces massed outside the city, UN and Yemeni sources said.

Nine civilians were killed and at least 13 wounded earlier this week in attacks in the provinces of Hodeidah and Hajjah in war-torn Yemen, the UN said on Friday.

The UN special envoy to Yemen on Monday said the urgency of accessing grain stores trapped in a frontline position in the port city of Hodeidah was increasing as the food was "at risk of rotting".

Newborn Yemeni conjoined twins whose plight sparked a plea for urgent medical treatment overseas died in Sanaa Saturday, rebels in the blockaded capital said.