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Yemen's Houthi forces shell Aden refinery, fire starts - witnesses, officials
One official at the facility said the storage tanks were full with fuel and other oil products.
The Houthis, who took over the capital Sanaa last September, have been battling local fighters in the south for three months, as Arab states have bombed the Houthis and have imposed a near-blockade on the country, which has cut off trade in food and fuel.
(Reporting by Mohammed Mukhashaf and Mohammed Ghobari; Writing by Rania El Gamal)