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At least 20 were injured, including 7 police, as the so-called indignados clashed with 200 police in central Madrid.
Observers call it the most serious event since protesters started gathering in Madrid's central plaza in mid-May.
TO SEE clash with En 1:02 report:
http://www.youtube.com/watch?v=CM9bWanWjm0&feature=player_embedded
