Giorgi Gakharia, a former prime minister of Georgia who now leads one of the country's main opposition groups, was hospitalized after being severely beaten, a spokeswoman for his party told Reuters.
The source stated that Gakharia had sustained injuries on his face and head during an assault by several men at a hotel lobby in Batumi, a city on the Black Sea coast.
His party, For Georgia, called the assault a "brutal, coordinated group attack" and said the government was to blame.
Georgia has been plunged into political crisis following an October parliamentary election which the opposition charges was stolen by the ruling Georgian Dream (GD) party.
Georgians have staged nightly protests in the capital Tbilisi and other cities since November, when the government said it would freeze European Union accession talks until 2028.
The pro-EU protests have been met with a crackdown by police, with rights groups pointing to hundreds of arrests and beatings. The government has defended the police's actions.
The attack on Gakharia, who served as Georgia's prime minister from 2019 until 2021, follows on the heels of other assaults on opposition figures and well-known journalists in recent months.
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