Alexis Grigoropoulos , 15 , was killed by a police bullet in December 2008 . The case has been widely covered and the Greek government is under pressure to take action against those responsible. Even before the official beginning of the march , police fired `` limited '' amounts of tear gas at hooded youths who set garbage cans on fire , blocked roads , and threw stones and plastic bottles at officers , police said . A police officer was found guilty in October of culpable homicide .
Alexis Grigoropoulos , 15 , was killed by a police bullet in December 2008 . The case has been widely covered and the Greek government is under pressure to take action against those responsible. A police officer was found guilty in October of culpable homicide .