The United Nations hopes to carry out the first medical evacuations from Aleppo on Friday, if a "humanitarian pause" in the Syrian army's Russian-backed assault on the city holds.
Despite a drop in violence after the unilateral ceasefire took effect on Thursday, there was little sign civilians were heeding calls to leave opposition-held areas of the city, and Russia accused the rebels of intimidation.
The unilateral ceasefire was initially described as lasting just 11 hours, but Russian Defence Minister Sergei Shoigu announced late Thursday that it would be extended "by 24 hours," leaving it unclear exactly when it will end.
East Aleppo, which the rebels captured in 2012, has been under siege by the army since mid-July and has faced devastating bombardment by the government and its ally Russia since the launch of an offensive to retake the whole city on September 22.
Nearly 500 people have been killed, more than a quarter of them children, since the assault began. More than 2,000 civilians have been wounded.