Video uploaded to social media on Tuesday purports to show heavy damage in the rebel-held al-Shaar neighbourhood of east Aleppo.
The date the video was shot is unspecified.
It was uploaded as Syrian government forces and their allies sought to drive a wedge between the al-Shaar neighbourhood and the remaining part of rebel-held eastern Aleppo to the southwest.
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Government forces and allies had advanced into al-Shaar, Zakaria Malahifji, a Turkey-based official with the Aleppo rebel group Fastaqim said on Monday.
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British-based monitoring group the Syrian Observatory for Human Rights said there were heavy clashes on Monday in al-Shaar.
The rebels defending al-Shaar may be forced to abandon it or risk being cut off from the other areas, rebel sources say.
Syria rejects any ceasefire negotiated by any party in eastern Aleppo unless what it describes as terrorist groups there depart, its Foreign Ministry said on Tuesday in a statement carried by state media.