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After the main USI student protest on Merrion Square ended, some of the crowd moved up Merrion Street and around the corner onto Merrion Row, where a group of protestors had entered the lobby of the Department of Finance.
This video is a record of the events which followed. It contains violence and strong language.
This Irish Times timeline of the events of the day seems pretty accurate:
http://www.irishtimes.com/newspaper/ireland/2010/1104/1224282635068.html