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Inside Syria, the fighting has spread to the two largest cities — the capital, Damascus, and the commercial hub of Aleppo.

U.N. World Food Program spokeswoman Elisabeth Byrs said more than 264,000 people are taking shelter in public buildings in the Aleppo region — about 200,000 in rural areas and more than 64,000 in the city.

Ms. Byrs said her agency is scaling up operations to provide food urgently needed by 1.5 million people this month, mainly in areas where there has been fighting and people have been made at least temporarily homeless.