Such claims are difficult to verify and often distorted owing to the propaganda value of the matter. Syrian and Russian state media maintain that rebels are holding the enclave's 275,000 remaining inhabitants hostage to use as human shields, even as the government's air force pounds the east's hospitals and first responder groups.
Opposition outlets on the other hand want to show that civilians will never accept returning to the government's heavy-handed rule. Russia has backed Syrian President Bashar Assad with vast military support as he fights to put down an uprising that is approaching its sixth year. Over 300,000 people have been killed in the raging war.
Hajj Mohammed al-Jasim told The Associated Press his uncles' families were trying to cross from the Bustan al-Basha neighborhood in the east to the predominantly Kurdish enclave of Sheikh Maqsoud.
"They've wanted to cross for a while because the circumstances have become very difficult," said al-Jasim, who confirmed his location near the al-Riz crossing via phone location services.
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He said his relatives told him they were prepared to cross during the day but were advised by three rebel groups to wait until dark.
The autonomous Kurdish defense forces, the YPG, have promised housing in Sheikh Maqsoud to any families who cross, or secure passage on to opposition-held Azaz or Kurdish-held Afrin, two towns north of Aleppo, according to the al-Jasim.
The Observatory reported 100 families are waiting to cross, while Ahmad Hiso Araj, a political official for the YPG-aligned Syrian Democratic Forces, said 250 civilians were prepared to go. He said they were communicating with their relatives in Sheikh Maqsoud to evacuate Bustan al-Basha.
The UN's chief humanitarian official Stephen O'Brien said Monday the conditions had gone "from terrible to terrifying and now barely survivable."
UN humanitarian official Jan Egeland warned two weeks ago that the east was running out of food. The area has been under siege by pro-government forces since August.
The government's air assault has been accompanied by pro-government troops pushing their way into neighborhoods on the edges of eastern Aleppo.