Tear gas and stun grenades were used to quell the violence amid wide-spread anxiety over the impact of the plan, which is linked to a needed bailout for the Greek economy, CNN said.
The Greek prime minister gave a final warning Sunday that the nation faces economic disaster if parliament rejects a strict austerity plan.
Parliament was to vote later in the day on the controversial measure, which is tied to a major bailout of the faltering Greek economy by the European Union and the International Monetary Fund.
The plan includes government job cuts, pension reductions and a 22-percent cut in the minimum wage; however Prime Minister Lucas Papademos said in a televised address the alternative would be Greece being "drawn into a vortex of recession" and its eventual departure from the euro, Euronews.net said.
Despite the dire warnings, Ekathimerini, reported Sunday a number of opposition members said they would vote against the proposal. The ruling coalition government, however, seemed to have the votes needed to carry the day.
Celebrity Breakups and divorces of 2014 [PHOTOS]