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ATHENS, Greece (AP) — Police say fingerprints taken from a bank robbery suspect have linked him to a domestic terrorist group.

Nikos Romanos, 20, was one of four suspects arrested Friday after allegedly robbing a bank and post office in northern Greece that day. Two of those suspects — Yannis Michailidis, 24, and Dimitris Politis, 21 — have earlier arrest warrants against them as members of the same terrorist group, the anarchist Conspiracy Nuclei of Fire.

Romanos became known in December 2008 when his friend, 15-year-old Alexandros Grigoropoulos, was fatally shot by a police officer after a verbal altercation in Athens. Grigoropoulos' death sparked days of riots. The police officer, Epaminondas Korkoneas, was sentenced to life imprisonment for the shooting.