Up to 16,000 people have been displaced in the Syrian city of Aleppo over the past few days following intense attacks in the rebel-held eastern part of the city, the United Nations has said.
Humanitarian chief Stephen O'Brien said the area has "no functioning hospitals left" and "official food stocks are practically finished".
Thousands more are expected to flee their homes in the coming days if the fighting persists, he added in a statement.
Warplanes pounded eastern Aleppo overnight killing at least 18 people, according to the Syrian Observatory for Human Rights - a UK-based war monitor.
The Syrian army and its allies made a huge advance across the northern part of besieged eastern Aleppo on Sunday night and Monday as rebels retreated to a more defensible front line after losing control of a key district.
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