Georgian police stormed the headquarters of the main opposition party in the early hours of Tuesday to arrest its chairman, Nika Melia.
Footage showed officers scaling a ladder to enter the United National Movement (UNM) headquarters from the roof.
Shortly afterward, they sprayed tear gas and forced their way into a room that had been barricaded by Melia and his supporters.
As officers led Melia away, he appealed for calm among his supporters.
A Tbilisi court last week ruled placing Melia, who is accused of organizing "mass violence" during anti-government protests in 2019, in pre-trial detention.
