Satellite images show increased use of heavy weapons in Aleppo, raising urgent concerns over the welfare of Syrian civilians, Amnesty International says.
Guardian journalist Martin Chulov, who is in the Syrian city, says the streets of Aleppo are eerie and silent.
"It just says something bad is about to happen," he told the Today programme.
"The regime forces have entered en masse just inside the outskirts of the southern half of Aleppo.
"Refuse is teeming up on the streets. Traffic isn't moving. There's no petrol. People are terrified and it's a general sense of foreboding as this decisive battle looms."
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