YouTube/America Today Syrian TV says a bomb has gone off in western Aleppo where dozens of people were gathered for a Christmas tree-lighting event.

No injuries were reported from Tuesday's bomb, which went off near Azizieh square in government-controlled western Aleppo.

A reporter for the channel said celebrations resumed a few minutes after the bomb went off. Dozens of Syrians were seen dancing and waving Syrian flags and red balloons to blaring music as they rallied around a giant tree decorated with Christmas lights.

Huge posters of President Bashar Assad and the leaders of Russia and Hezbollah were put up.

The celebration in western Aleppo was taking place on the same day as the evacuation of the last rebels and residents of the former rebel-held enclave in eastern Aleppo was taking place.