The forces of Bashar al-Assad are thought to be preparing an assault on Syria's biggest city after capturing the strategically important town of Qusair with large-scale backing from Lebanon's Hizbollah.
The rebels' loss of the town - which holds symbolic value for both sides in the country's vicious civil war - after three weeks of bitter fighting comes amid reports that the regime is readying an attempt to retake Aleppo.
Such an attack could come with further help from Hizbollah; some commanders of the Shia militia claim they are ready to take thousands of men across the border.
The opposition holds about half of the northern city, and a battle to retake it is likely to be bloody.
Large swathes of territory remain outside the control of the regime 2 years after the start of the uprising. But recent gains on the ground have put Assad in a stronger position.