A group of demonstrators stood at the base of the Capitol bldg in support of Greek Anarchists. rnRiots broke out in Athens after the shooting death of 15 year old Alexandros Grigoropoulos. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> AP reports At around 4 p.m. Saturday, about 150 youth attacked the Christmas tree at Syntagma Square in central Athens, hanging trash bags from its branches before clashing with riot police. The square was cleared within two hours. At least three news photographers were injured by police batons. The tree survived the attack. The Christmas tree protest had been advertised as part of a day of events in Greece and around the world to commemorate Grigoropoulos' shooting.rnBy DEMETRIS NELLAS APr