Greek authorities say about 30 masked youths have attacked a police foot patrol in central Athens with hammers, lightly injuring two officers.
Police said in a statement Tuesday that the youths also used stones and wooden clubs against the three-member patrol in the capital's Exarcheia district, a haunt of anarchist groups that frequently clash with police.
No arrests were reported.
Anarchist demonstrators have played a leading role in clashes with riot police during frequent anti-austerity protests in Athens over the past year. Police have been accused of using excessive violence in quelling the violence.