AlJazeeraEnglish : John Holmes, a senior United Nations humanitarian official, has been visiting refugees in Yemen left homeless by the fighting between government troops and Houthi fighters.

"We can't assess just how serious the situation in the Saada governorate is because we don't have access there for the main international organisations, although there are, of course, non-governmental organisations like the Islamic Relief and we are able to provide some form of assistance," Holmes told Al Jazeera.

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