ATHENS , Greece ( CNN ) -- Thousands of youths demonstrated in central Athens Friday as anger flared in the Greek capital following the shooting of another teenager . High school students protest in front of their school in the western Athens suburb of Peristeri . A group of youths targeted the French Institute , a language and cultural institute , and police scrambled to the scene to contain the incident . The situation began heating up during a protest rally Thursday that followed the bizarre shooting of a high school student in an Athens suburb earlier this week . The 17-year-old was hit in the hand by an unknown assailant as he was talking to a group of schoolmates in the western suburb of Peristeri . Initial police reports showed the student -- the son of a leading trade unionist -- was hit with a .38-caliber handgun . Police said no officers were patrolling the region at the time of the incident . The mysterious shooting has enflamed widespread student anger over the fatal police shooting of a 15-year-old boy December 6 , which sparked Greece 's worst riots in decades . Watch more about the flare-up of protests » . Students rallied Friday in response to the shooting of the 17-year-old . One of the rallies was planned for central Athens ; the other in the suburb where the student was shot . Later in the day , scores of artists are scheduled to gather in central Athens to stage a protest concert in response to the initial shooting of 15-year-old Alexandros Grigoropoulos . Daily protests since the December 6 shooting , including riots , have thrown Greece into turmoil and have become a simmering anger about the conservative government 's handling of the economy , education , and jobs . A string of labor unions called on workers to march on Parliament Friday to protest the voting of the 2009 state budget , which calls for additional belt-tightening measures in response to the global financial crisis . Student unions were also gathering to across the country to determine their course of action for the next few weeks . At least 800 high schools and 200 universities remain shut as thousands of youths have seized the grounds and campuses in protest . The unrest is threatening the government 's hold on power , with some opposition groups calling for fresh elections . Stores and international businesses have been attacked , and at least 280 people have been detained by police . Of that total , 176 were arrested , 130 of them for looting . Of the two officers involved in the death of the 15-year-old , one is charged with premeditated manslaughter and the other with acting as an accomplice .
17-year-old shot by unknown assailant in Athens suburb of Peristeri . Police said no officers were patrolling the region at the time of the incident . First protests flared on Dec. 6 after police killing of 15-year-old boy . Simmering anger exists about government 's handling of economy , education , jobs .