Police are conducting a large-scale operation in Roma settlements in western Athens as part of a crackdown on crime amid unrest following the police shooting of a 16-year-old Roma in northern Greece.
Multiple raids are being carried out at settlements in Aspropyrgos, Zefyri, And Liosia and Acharnes.
Seven suspects were detained on drugs-related charges in similar operations in the same areas Thursday.
The raids come after a third night of clashes outside Roma settlements near Athens.
The 34-year-old police officer who allegedly fired the shot is set to appear in court in Thessaloniki Friday for questioning on charges of a felony count of manslaughter with possible intent, and a misdemeanor count of illegally firing his weapon. A protest is being held outside the court.