Hungarian police fired rubber bullets and tear gas on Monday to disperse anti-government protesters marching on Parliament on the 50th anniversary of the country’s uprising against Soviet rule. Local news agency MTI said several people had been injured in the clashes in central Budapest.

Hungary’s opposition parties called on Tuesday on Prime Minister Ferenc Gyurcsany to quit after thousands of people took to the streets in a night of anti-government riots in which 150 people were injured. The riots, the worst in Hungary since the end of communism, were triggered by the leak of a tape on Sunday in which Gyurcsany said he and his Socialist party had lied for four years about Hungary’s parlous budget.