Thousands of anti-government demonstrators rallied in the capital of ex-Soviet Georgia on Saturday demanding snap polls after the opposition said parliament elections two weeks ago were marred by fraud.

The ruling Georgian Dream party led by the country's richest man and former prime minister Bidzina Ivanishvili narrowly won the October 31 poll that opposition parties denounced as rigged.

Opposition parties have refused to enter the new parliament in a boycott that has undermined the ruling party's legitimacy.

In an unprecedented show of unity before the vote, the main opposition party, exiled former president Mikheil Saakashvili's United National Movement (UNM), agreed with smaller opposition groups to form a coalition government if elected.

Thousands of demonstrators gathered outside parliament on Saturday promising to keep up the protest movement until new elections are called.

Georgia Dream has rejected the demand insisting the vote was free and fair.

"We will continue protests until our demand is met," Nika Melia, an UNM leader, told the crowd, saying the October ballot was "stolen."

Opposition supporters have vowed to continue protesting until new elections are called
Opposition supporters have vowed to continue protesting until new elections are called AFP / Vano SHLAMOV

Forty-year-old baker Nukri Archvadze told AFP at the protest that, "Ivanishvili and his Georgian Dream have staged a coup by rigging the elections."

"They must call a fresh vote and leave power."

Last Sunday, 45,000 protesters rallied outside parliament before marching towards the central election commission headquarters, threatening to blockade its entrances.

Riot police dispersed the protesters in the early hours of Monday with firing water cannon leaving several people injured.

The electoral commission has yet to confirm provisional results that showed Georgian Dream won 48 percent of the votes against 46 percent for opposition parties, in a proportional ballot that decides 120 of the legislature's 150 seats.

Owing to Georgia's complex electoral system, the parliament's final makeup might only become clear in late November.

In power since 2012, Georgian Dream has seen its popularity fall due to discontent over its failure to address economic stagnation and perceived backsliding on commitments to democracy.

Critics accuse the country's richest man Ivanishvili -- who is widely seen to be calling the shots in Georgia -- of persecuting political opponents and creating a corrupt system where private interests permeate politics.