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Instances under investigation include vans running over demonstrators
Spanish police cite public order and security concerns to justify measure
One person in very serious condition, as protesters play cat and mouse game with police, whose operation is also in the spotlight, especially among journalists
Political anger as neo-nazis march through Barcelona on another night of violence and chaos
The protests have already caused delays and cancellations at El-Prat
Spanish and Catalan police officers force protest out of lobby and only ticketed passengers are allowed entry into premises