An opposition rally, joined by over 30,000 demonstrators, has begun in Rose Revolution Square in Tbilisi center.
The rally has been staged to protest the outcome of the January 5 presidential election, which the Central Elections Commission declared won by Mikheil Saakashvili.
The opposition argues that the election was rigged.
In freezing temperatures falling down to minus 5 degrees, Celsius - an untypical occurrence for this southern capital city - more opposition supporters are coming. Organizers earlier claimed the rally would gather 100,000 supporters.
A convoy of 300 vehicles left western Georgia and is heading towards Tbilisi, they said.
Few police officers can be seen in the square thus far, and many are in stores and in the underground to keep warm. The traffic has been effectively banned in Rustaveli Avenue in downtown Tbilisi.
Opposition supporters will further move towards the parliament building, where another rally will be held.