Asked how bad the situation on the ground is, Mr Clarke said: 'It's difficult to exaggerate how completely devastated the city is. There is not a single building that is either unburnt or unbroken.
"The fires are still burning, people have been cooking on wood fires outside their bomb shelters or in their bomb shelters. "There are dogs feeding on chunks of bone, human bone, bits of people. There are freshly dug graves everywhere.
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