Russian and Syrian government forces have begun a 10-hour ceasefire in the city of Aleppo to allow rebels and civilians to leave besieged areas.
Russia has said this pause will be the last chance for rebels to leave eastern districts in safety.
The rebels have rejected the offer and have been continuing a counter-offensive aimed at breaking the siege.
About 250,000 people remain trapped and are enduring food and medical shortages as well as intensive bombing.
A BBC correspondent in Aleppo says the battle in the city is escalating, with the government determined to recapture districts still outside their control while the rebel forces do not want to lose their last remaining foothold in a major Syrian city.
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