They were prompted by reports on social media of plans for an organised movement to cross Greece's northwest land border with Albania in early April.
Riot police fired teargas at dozens of people - some with children in their arms - who threw stones and bottles as they tried to break a police cordon and reach a road leading to the border.
About 100 tents were pitched in the field which was heavily guarded by police. People refused to leave despite calls by ministers to return to accommodation centres and warnings that onward travel would be impossible.
"It's a lie that the borders will open," Migration Minister Dimitris Vitsas told Greek state television ERT on Friday.
Tens of thousands of refugees and migrants, mainly from Syria, Iraq and Afghanistan, are stuck in Greece from when Balkan countries shut their borders in 2016, closing the main passage towards northern Europe.
LEAVE A COMMENT Your email address will not be published. Required fields are marked*
Assange hearing to be split in two parts
US’s Mnuchin tells Thunberg to go ‘study economics’ in Davos spat
Putin calls for summit of key UNSC members
Epidemic response group says starts work on 3 possible China virus vaccines
Prince Charles sounds climate alarm
'No doubt' e-cigarettes harmful: WHO
'Man of so many talents' - Monty Python's Terry Jones dies aged 77
UK steps up checks on flights from China virus centre
Greece elects first woman president for 'new era'