The years-long conflict coupled with the Saudi-led economic blockade has fuelled famine and disease, affecting children the most.
Yemen's government and Houthi rebels agree on first phase of pullback of forces from Hudaida port city, a deal UN describes as "important progress."
Martin Griffiths, UN envoy for Yemen, says, "Such changes in timelines are expected, in light of the facts that the timelines were rather ambitious and we are dealing with a complex situation on the ground."
Saudi and Houthi media said drones belonging to the rebels hit a parade in Lahaj province, killing at least six soldiers. Eyewitnesses say high-ranked officials including Yemen's deputy chief of staff were wounded in the attack.
The rebels have begun to withdraw from the port city, the country's key aid lifeline, under a UN-brokered agreement reached in Sweden earlier this month.
Houthi rebels have blocked roads linking the cities of Taiz and Hudaida, denting efforts to provide aid in a war-torn country where almost 14 million Yemenis are on the brink of famine.
UN special envoy Martin Griffiths urged Yemen's warring parties to respect a ceasefire accord struck at peace talks in Sweden after deadly clashes in the port city of Hudaida.
The rebels have put up fierce resistance to the government advance towards the city's vital docks, which are the point of entry for 80 percent of Yemen's commercial imports and nearly all UN-supervised humanitarian aid.
In addition, three more people were killed and six injured when strikes hit three vehicles in Al Hali District in Hudaida province, the UN's Office for the Coordination of Humanitarian Affairs said in a statement Thursday.
UN aid chief warns 3.5 million people may soon be added to the eight million Yemenis already facing starvation as aid agencies fail to fight against famine in the country.
The decision to halt oil exports through the Red Sea, which is vital for oil shipments from the Middle East, came after an attack by Houthi rebels in Yemen.
UN envoy to Yemen Martin Griffiths arrived on Monday in Sanaa for talks aimed at halting military escalations in the coastal city of Hudaida.
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