Police were on Monday morning searching an apartment building where two people were arrested for possession of molotov cocktails late on Sunday.
The building is located in the central Athens neighborhood of Exarchia where police clashed with protesters after a march marking the 46th anniversary of a student uprising against the then-ruling Greek military dictatorship.
More than 5,000 police officers will be on duty on Saturday and Sunday for events commemorating the 46th anniversary of a student uprising against Greece's junta amid simmering tensions following a series of raids on squats as well as a standoff earlier this week between police and students at the Athens University of Economics and Business.
A man believed to be linked to the Islamic State terrorist organization was late on Monday stranded in the buffer zone on the Greek-Turkish border, according to reports.
In a statement, the Greek Police (ELAS) said that a US citizen of Arab origin was brought to a Greek border post by Turkish officers who cited the expiry of his visa and asked Greek authorities to take him in.