Source:
The GuardianProtesters who have camped out in Spanish squares for the past 12 days clashed with police for the first time on Friday after authorities dismantled a camp in the centre of Barcelona.
Police and clean-up trucks moved into the Plaça de Catalunya, with about 200 protesters being corralled peacefully in the centre of the square.
Protesters were told they were not being evicted and would be allowed back, but municipal workers took away tents, mattresses, tarpaulins, computers and materials used to build the camp.
Trouble erupted when thousands of supporters arrived and blocked access roads. Police cleared routes out of the square by using batons, reportedly injuring 99 people and arresting two.
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http://www.guardian.co.uk/world/2011/may/27/spanish-protesters-clash-with-police