Article published on the 2008-12-21 Latest update 2008-12-21 14:42 TU
Grigoropoulos by a police officer two weeks ago.
Stones and petrol bombs were thrown at the police, who responded with teargas, and dustbins were set of fire. Molotov cocktails were thrown at police in other parts of the city.
Police also clashed with about 200 anti-racist demonstrators on Saturday.
In the northern city of Thessalonoki, young people occupied a hall being used for a film festival and threw pies at Vassilis Papageorgopoulos.
On Friday masked youths attacked the French cultural institute after a demonstration over a second shooting on Wednesday in which the son of a teachers' union official was injured.
Correspondent Helena Smith says that the protests are an expression of "sheer rage amongst the younger generation of Greeks", which extends from the killing to the conservative government’s social and economic policies.
"As we speak, the government’s budget for 2009 is being debated in parliament," she told RFI. "There’s anger over that, a feeling that the government is passing laws for the benefit of the rich at the expense of the poor when a lot of younger Greeks are struggling."