the united nations has been denied access to the where tensemeni city of thousands of people have been displaced. they had been under siege for over a year and the residents have been suffering under severe shortages of basic supplies. laura: blocks from reaching people in desperate need, the u.n. humanitarian chief has been blocked access to the city. >> my convoy was denied passage at the last checkpoint. humanitarian efforts to reach people in the once again thwarted by parties to the conflict. reporter: a stay, residents have to cross mountains ground to fetch water and rice. risking crossfire, it is the only route they can cross through. the east and mountaintop district under rebel control, the city center by loyalist forces. >> people were sick or injured, that is what is happening. we fled and left all that we own. how could we stay there. made of lord deliver us and those who died. reporter: it has been under blockage by the uzis -- by the houthis for more than a year now. 7 million people require emergency food assistance in yemen including nearly half a million children suff