The attack, began Thursday, was launched by the Yemeni government forces backed by Saudi border artillery forces and more than 20 air strikes against Houthi positions in al-Kadif areas in southern Medi and in al-Hajawirah area and al-Majbar area in southern Haradh, according to the source.

At least 10 others were also wounded in Saada province after attacks on Friday on a house and a private vehicle, the UN's Humanitarian Coordinator in Yemen Jamie McGoldrick said, citing reports from fellow aid groups.

The new incidents were an example of the "brutality" of the conflict, McGoldrick said in the statement, in which he expressed deep concern.

Gregory Hartl, a spokesman for the organisation, confirmed that Saudi Arabia, which leads an Arab coalition battling rebels in Yemen, had signed an agreement committing the funds to help the World Health Organization battle the spread of cholera.

"All parties to the conflict continue to show a disregard for the protection of civilians and the principle of distinction between civilians and combatants in the conduct of hostilities". A report by three United Nations agencies last week said the vicious combination of war, cholera and hunger has left 80 percent of Yemeni children in desperate need of aid.

The Houthis hail from the Zaidi branch of Shia Islam and they control much of the north of the country. They see the war as an attempt by Iran to expand its influence in Yemen.

Human rights groups have called Saudi's actions in Yemen "war crimes".

It was not immediately clear if the house was hit by mistake, but the coalition says it does not target civilians.

Jeddah: Saudi Arabia has pledged $33.7 million to help the World Health Organisation eradicate cholera in war-wrecked Yemen, where the disease has killed almost 2,000 people, the WHO said on Sunday.

The Red Cross has warned an estimated 600,000 people could contract cholera as the epidemic sweeps through Yemen, where around 70 per cent of the 27 million population is now reliant on some form of humanitarian aid.