Moscow said it was extending the unilateral "humanitarian pause" in the Syrian government's Russian-backed assault on opposition-held east Aleppo until 1600 GMT tomorrow.
But there was no sign that civilians or rebels were heeding calls to leave, with Damascus and Moscow accusing opposition fighters of preventing evacuations.
In Geneva, the UN rights council called for a special investigation into the violence in Aleppo in a resolution fiercely critical of Syria's government.
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.
The scale of the casualties has prompted outrage in the West, with Washington saying the bombardment amounted to a possible war crime.
Russia announced a halt to its air strikes from Tuesday and the unilateral ceasefire from yesterday.
"There has been no movement in the corridors in the eastern district. For the moment, we haven't seen any movement of residents or fighters," said Rami Abdel Rahman, head of the Syrian Observatory for Human Rights.
Syrian state media accused rebels of preventing people from leaving the city's opposition-held sector.
And Russian Foreign Minister Sergei Lavrov said fighters were using "threats, blackmail and brute force" to prevent civilians and rebels evacuating.
But today afternoon, a spokesman said the operation had been delayed because of security concerns.
"Medical evacuations of sick and injured could unfortunately not begin this morning as planned because the necessary conditions were not in place," said Jens Laerke of the United Nations humanitarian office OCHA.
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