The conflict has displaced three million Yemenis and forced 200,000 people to seek refuge abroad, McGoldrick said.
The United Nations had information that 900,000 of those displaced intended to try to return to their homes, he said.
"This is a big challenge, especially in areas still experiencing conflict," McGoldrick said.
Some 14 million of Yemen`s 26 million population need food aid and 7 million are suffering from food insecurity, he said.
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