Policemen try to maintain order during a protest marking the two month of the "Occupy Wall Street" protest outside the New York Stock Exchangein New York, the United States, Nov. 17, 2011.  Protesters failed in their bid to shut down the New York Stock Exchange. The opening bell was sounded at 9.30am as usual; outside, there were scuffles and arrests as marchers, who had gathered in Zuccotti Park at 7am, attempted to block access to Wall Street. [Photo/163.com]