September 8, 2009 5:47 pm NY Celebrates the 400th Anniversary of the Discovery of the Hudson River A parade of ships line the Hudson River to mark the 400th anniversary of its discovery. Local 0:34 City College of New York goes remote as protests continue 14:23 NYPD arrests around 100 protesters at Columbia University 29:11 NYPD moves in on protesters at Columbia University making dozens of arrests 1:45 NYPD enters Columbia University in riot gear to clear protest 3:24 Mayor Adams and the NYPD urge protesters to leave Columbia University