Rebel forces in Syria have taken control of the "majority" of the country's second-largest city, Aleppo, observers said.
The offensive is the largest against the Syrian government in years and the first time rebels fighting the forces of President Bashar al-Assad have reached Aleppo since being forced out by the army in 2016.
It is thought that more than 300 people - including more than 20 civilians - have been killed since the offensive started on Wednesday.
Overnight, Russia has launched air strikes at rebel targets in the city, and a Kremlin spokesman expressed his support for "the government of Syria to quickly restore order”.
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