Protesters were seen clashing with police at a demonstration in Athens on Sunday held in protest over the recent agreement between Greece and the Former Yugoslav Republic of Macedonia (FYROM) to settle their ongoing naming dispute.
Footage showed the protesters carrying Greek flags and clashing with police as night descended on Athens.
Several protesters blocking a road were dragged off by police in riot gear.
Under the new deal with Macedonia, the country would be renamed the Republic of North Macedonia.
The agreement still needs to be ratified by the Macedonian parliament however, and then confirmed via referendum in September.
Following that, it will need to be confirmed by Greek lawmakers to come into effect.