Syrian government forces swept through the old city of Aleppo as rebel forces - besieged and facing certain defeat - debated when to withdraw from their shattered stronghold.
The army and allied militiamen now hold three-quarters of east Aleppo, four years after the area fell from government control.
The Syrian Observatory for Human Rights, a monitoring group, said forces allied with Syrian President Bashar al-Assad took over the old city after rebels withdrew south into what remains of their territory.
As the United States and Russia prepare talks on the prospect of a rebel withdrawal, the militants themselves now seek escape. They called for civilians to be allowed to leave for the northern countryside during a five-day ceasefire.
But officials within the armed opposition, said a much broader agreement was in the cards involving full withdrawal from what was once their most important stronghold. Activists said dozens of rebels had already fled.