At least 65 people were injured and 27 arrested as baton-wielding police clashed with protesters, who attempted to surround the building of the Spanish parliament in Madrid, local television channels reported.
The violence flared up on Tuesday night after participants of the Occupa el Congresso (Occupy the Congress) movement tried to break through the metal barriers, set by police, and move closer to the parliament's building, RIA Novosti reported.
Television channels reported that 27 policemen, who also fired rubber bullets on protesters, were injured in the clashes, while authorities estimated the total number of protesters at 6,000.
Participants of the movement, which is also known as 'indignados,' are protesting against the high level of unemployment in the country, corruption in the current political system and unpopular reformations in economic, educational and health spheres.