Georgian police fired rubber bullets and tear gas at protesters attempting to storm parliament on Thursday after a Russian lawmaker addressed the assembly from the speaker's seat, causing uproar in Tbilisi.
Ambulances evacuated several injured protesters, an AFP reporter witnessed.
About 10 000 protesters had gathered outside parliament after a controversial address by Russian MP Sergei Gavrilov. Some broke through riot police cordons to enter the parliament courtyard.
They were pushed back by police but some continued surging forward, prompting police to fire rubber bullets and tear gas, stopping after many of the protesters broke away and left.
About 3 000 remained outside parliament after the tear gas subsided.
Earlier, tens of thousands also rallied in the streets of central Tbilisi, demanding speaker Irakli Kobakhidze step down after Gavrilov's address to an annual meeting of the Inter-parliamentary Assembly on Orthodoxy (IAO) - a forum of lawmakers from predominantly Orthodox countries.
The Russian MP's presence in fiercely pro-Western Georgia's parliament prompted outrage in the ex-Soviet nation which in 2008 fought and lost a brief but bloody war with Moscow over the breakaway regions of Abkhazia and South Ossetia.
A group of Georgian opposition lawmakers demanded the Russian delegation leave the plenary chamber.
Georgian oligarch Bidzina Ivanishvili - widely believed to be calling the shots in Georgia as the leader of his ruling Georgian Dream party - said in a statement he "fully shares the sincere outrage of the Georgian citizens".
"It is unacceptable that a representative of the occupier country chairs a forum in the Georgian parliament," Ivanishvili said.
He added he had told speaker Kobakhidze, to "immediately suspend" the IAO session.
In a statement, the US embassy in Tbilisi urged "all sides to remain calm, show restraint and act within the framework of the constitution at all times".
It said it understood "the hurt that many people feel" in Georgia.
Headquartered in Athens, the IAO is a permanent, international forum of MPs from predominantly Orthodox-Christian countries.
Georgia and its Soviet-era master Russia have long been at loggerheads over Tbilisi's bid to join the European Union and NATO with the spiralling confrontation culminating in a full-out war on August 8, 2008.
The Russian army swept into Georgia - bombing targets and occupying large swathes of territory - after Tbilisi launched a large-scale military operation against South Ossetian separatist forces who had been shelling Georgian villages.
Over just five days, Russia defeated Georgia's small military and the hostilities ended with a ceasefire mediated by France's then-president Nicolas Sarkozy, who at the time held the EU's rotating presidency.
After the war, which claimed the lives of hundreds of soldiers and civilians from both sides, Moscow recognised South Ossetia and another separatist enclave, Abkhazia, as independent states where it then stationed permanent military bases.
Tbilisi and its Western allies have denounced the move as an "illegal military occupation".
The two regions constitute 20% of the country's territory.
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